I think it's absolutely wild how DATV and DA2 are complete opposites of each other almost down to the letter. I find this super interesting because both were 'rushed' (DAtV as it stands today only had a few years in development, even though there was a ten year gap because they kept scrapping things) and yet the developers chose to focus on completely different things when they knew they wouldn't have as much time as they'd like.
DAtV is an absolutely beautiful game in terms of graphics. Stunningly so. Even for the time it came out, DA2 had bad graphics.
DAtV has multiple interesting maps; even those without a lot of content are still varied and again, quite beautiful. DA2 reuses all it's dungeon maps without shame.
DAtV allows you to create a Rook with a unique backstory, race and appearance. DA2 you have to be human and you'll always have the same backstory.
HOWEVER DAtV doesn't give Rook a lot of real choices or personality options. Rook acts the same basically no matter how you play them. Hawke has three main personalities and when the game doesn't let you pick dialogue it will make Hawke speak in whatever of these three you most commonly pick.
DA2 is a game about systematic injustices, power and how you deal with both. DAtV scrubbed all systematic injustices from Thedas and made all that stuff background at best, completely ignored and forgotten at worst.
DA2 is full of companions who can be genuinely antagonistic with the player; they even have a rivalry system to account for the fact. A lot of cut scenes can end with you shouting or being mean to each other. DAtV everyone is nice and speaks in therapy speak. There's no real way to lose approval or to get mad at your companions.
DA2 has companions who hate one another; they're antagonistic if you bring them out and they are just mean a lot of the time. The closest DATV gets to this is Taash and Emmrich and rook 'solves' their fight super easily and then they get along great. Also, the reason they're arguing is just Taash finds Emmrich creepy not you know. A big political difference in opinion.
DA2 gives Hawke the chance to pick 'evil' options. You, personally, can kill your companions and you can also just be a dick. DAtV forces you to play as a hero all the way down to the heroic pre-written backstory.
There's I'm sure more contrasts. But I think what it comes down to is that DAtV prioritised being a 'good' game in terms of things like graphics, maps and had a more sanitised version of Thedas so 'everyone' could enjoy it. Whereas DA2 dropped the graphics and maps almost completely so it could focus on conflict, politics and interpersonal relationships.
And I think this kinda mirrors a LOT of modern gaming compared to games made 10 - 20 years ago. But it's even more starkly obvious because of the fact that they were both rushed so it's very clear what prioritises they picked.