Feel like this is better answered on my mod blog here than that blog.
Megatron has always been a jerk. He unapologetically starts a war that almost destroys Cybertron and makes his own species near extinct. Redeeming him has always felt like a grab at “he’s popular with fans so he can do anything and still get a good ending” thing and to ‘win popularity’.
He outright abuses Starscream in pretty much every continuity and only tends to show regret when he’s in trouble or might, god forbid, face consequences (looking at you tfp finale).
Besides, the fandom has already done “Megatron but he’s a sweetie/secret goodie/redeemed” 50,000 times or more already.
I play Megatron as an outright villain.
Galvatron on the other hand has LOADS of character aspects and parts of him that go unexplored, which is a surprise as a character whose canonically a mentally ill abuse victim would seem like a more popular character among fans. Alas, no, people just make him mindlessly violent, which is... uncomfortable given when Galvatron was violent towards his own men it was due to a mental breakdown, it wasn’t with Megatron, but which one does the fandom make out to be the ‘violent monster’... yeah, ouch.
He has way more openings for being a nice and soft character, only bolstered by BWII Galvatron being the most goddamn sweet fellow.
Galvatron isn’t “somehow a sweetie” he’s been shown in canon to care about Cyclonus’s safety more than his own, something the former never did unless they were ‘useful’ to him.
I portray Galvatron as something he hasn’t been in a long while. A character.
I also to be fair haven’t done a lot of Galvatron’s dark times in this AU, when he first came to life here he did massacre a load of Autobots and all sorts.