Since @orchids-skyflame asked me over on Twitter which version of the AsuCaga kiss in Seed I prefer more, I figured I'd just write the Massive Wall of Text here, because the post I was writing in Notes on my phone was getting crazy long, to the point where I'm pretty sure it's more than 4 screen shots.
As a refresher, this is a(n unsubbed) clip someone posted of the original version off of the original DVD release of Seed, and this is the same scene, but from the remaster. The dialogue for both versions is the same, but it's the animation that's different, and I think it leads to some changes in how the scene comes across, and I think it's worth discussing.
But if you're not here for a Massive Wall of Text (that will include discussion of AsuCaga into Seed Destiny and Seed Freedom) and just want the short version, the answer is the original, even if AsuCaga kissing with the Earth in the background makes for a very pretty and romantic picture.
(Long answer behind the cut, in writing about this scene I kind of just ran off on an entire tangent about them so, uhhh, take it as you will? XD)
The biggest difference between the two versions is what Athrun does is the opposite - in the original, he pulls Cagalli into his arms before telling her he's glad they met, whereas the remaster has him moving towards her and surprising/flustering her with the hug. And watching both back to back, I realized I came away with two very different sets of feelings from each version.
In the remaster, with Athrun going to Cagalli and hugging her, it puts a greater emphasis on his vow to protect her. He's moving towards her, to cover and shield her, and with the Earth behind both of them as they're kissing, it's putting this idea that Athrun is going into this final battle to protect Cagalli and the Earth. And while that does align with his character and nature as a protector first and foremost, it doesn't match his mindset at that time, and it's something that I think the original scene does a better job of.
With the original, there's a vulnerability to Athrun's body language pulling Cagalli towards him that mirrors his mental/emotional vulnerability in that moment - he has to open his arms (thus metaphorically opening himself up) to pull her in and hold her close. Up until the moment he was shot by his father, he'd believed that his own life had value and meaning to his father, that he was more than a tool, that he was doing something meaningful by fighting to protect PLANT in the service of its military. That his father, like him, was fighting to prevent another Bloody Valentine, and if Athrun had to sacrifice himself in the process, so be it. But GENESIS changed all of that, and it made Athrun realize his father was so lost in his anger and need for revenge that he could no longer see reason, let alone stop and listen to his last remaining family, his own son (who arguably, as a father, Patrick would be hoping to create a better future for) reach out to him to say "Hey, maybe killing all the Naturals isn't the answer here".
And in the process, Athrun's left adrift, separated by his father due to the massive difference in their ideals - despite having a new cause to fight for, it still doesn't help him deal with his inner turmoil in finding he no longer believes in the cause he risked his life for, and, by extension, his connection to his father. What hope is there for him, then, if he can't even talk his own father down from believing and spreading the idea that genocide is the answer? He hasn't given much thought to what comes after - after all, why should he if there's no reason he'd live to see tomorrow - but at the very least in joining the Clyne Faction and the Three Ships Alliance he can protect the people he cares about and stop both sides from destroying each other in an all-out war of mutual destruction.
So here he is, getting ready to sortie into what's shaping up to be the final battle, and he's ready to sacrifice himself here if it means he can stop his father from ending all life on Earth as they know it (and simultaneously make up for it). And here comes Cagalli, telling him she's going out there this time too, because she "doesn't want him to die". And it's not even a general "I don't want more people to die (because I've had enough people I care about die)", it's a very specific "I'm going out there, to make sure you don't die ... and to make sure Kira, who's maybe my little brother (read: my last surviving blood family member) doesn't die either", with an unspoken "because both of you are so important to me I'm willing to risk my life to make sure both of you come back from this battle alive" attached to it.
And Athrun's surprised, because this entire time, he's been told "You're a soldier, if you die fighting to protect PLANT, if you die in battle carrying out your duty as a soldier, your sacrifice will be worth it to make sure PLANT stays safe for another day, so it's okay to throw your life away for this." And it's Cagalli who's reminding him (again) that here's someone who sees value in him continuing to live, someone who desperately wants him to keep living, because she genuinely and sincerely cares about and loves him as an individual, at least as much, if not arguably more than her last surviving family member. And in him pulling her into his arms, it's like he's taking those feelings and accepting and cherishing them, holding them close to him - his heart, really - because in doing so, she gave him a purpose and meaning and something to live for at a time when he felt like he had nothing.
And this sets the stage for the later scene inside GENESIS' reactor room, where she tells him it's a bigger battle to keep living instead of sacrificing himself there like that (so won't he take her hand, her offer of salvation, by hopping in the Rouge with her so they can escape together). And I'm sure it's here that he's decided (if he hadn't before when he kissed her) that he'd live (and die) for her, because more than any other person in his life, she's the one person who most consistently tells him to live, and to keep living no matter what, because he's as important to her as what's left of her family.
And it also feeds into his desperation in Seed Destiny - he really didn't want to go back to ZAFT, but as Alex Dino he had no power, and power is what he needed because between Cagalli's arranged marriage to Yuna and the world spiraling into war again, he felt powerless to stop anything and again, lost his sense of purpose. But at the same time, Cagalli did too, and it's not until the end, when she's sending off the Archangel and they, again, hold each other before a final battle, that there's this wordless exchange. They're both building a better future that has a place for both of them to be together, side by side. And like before, it's him initiating the hug by taking her into his arms, but this time it's the opposite; this time it's him saying "I know you're no longer wearing my ring, but it's okay, we don't need to rush, I still cherish and love you despite everything that's happened." And her hugging him back despite her initial hesitation (because she's the one who took the ring off in the first place as to say she's breaking up with him) is her response - even if she has to (publicly) let him go for now, he's still important to her, she still holds onto him in her heart as tightly as he holds her in his.
So is it any surprise, then, when the chips are (arguably) down, it's Cagalli that Athrun thinks of? That she is his mental (and emotional) shield, to the point that she's enough to turn the tide of the duel in his favor? That despite saying upon their first meeting that he'd kill anyone who tries to steal the Aegis from him, he willingly cedes control of both the Amazing Z'Gok and the Infinite Justice Type II to Cagalli, a less skilled pilot, for her to control them remotely? And when he finally taps into his inner strength to decisively win the duel, it's her colors that come bursting out of his Seed break animation as he's telling Shura that true strength isn't in combat prowess but the will to live (something that Cagalli's taught and reminded Athrun of time and time again)?
On the flip side, the remaster mostly has Cagalli present as a passive participant in the scene - Athrun surprises her with the hug, he's the one who makes the move to kiss her and it's not until near the end as the camera pans back that she kisses him back. It's set up to emphasize Athrun's half of the promise. The original still has her surprised by the hug, but the kiss? That was mutual. She meets him in the middle, and it makes her an active participant in that scene, on par with her Action Girl status up until that point. And it puts her on equal importance, that her vow of protection - despite being the less skilled pilot out of the two of them - is just as important as his, that to Athrun, her determination and desire to protect him is equal to his determination and desire to protect her.
And that desire is what drives her to keep trying her hand at diplomacy and politics even when she's (quite frankly) terrible at it in the beginning of Seed Destiny, because she's been out-maneuvered by people who don't agree with her world view that Naturals and Coordinators can live in harmony (because what they don't realize is that "Alex Dino" is as much her strength as she is his). And in the end, when she ultimately starts getting results (in large part thanks to Durandal conveniently killing off the Seirans and their political allies), it's in service of creating an Orb where Athrun also has a place next to her, not in disguise, but out in the open as himself.
And it's a real pity that Seed Freedom doesn't give Cagalli the opportunity to tap into her Seed mode, because despite the time they spend (physically) apart he's as much a part of her life as she is a part of his, and it would've been nice to have seen it represented on screen with his colors bursting out of her Seed break animation.
So all in all, I like the original version better, because I think it ties better into their future relationship and reflects their situations better.
