The beginning of D:OS2 felt like a cheat code to get more BG3 after I'd already finished BG3, but as time went on, I found that everything from RPG systems to pacing of combat/non-combat is leagues better in BG3, to say nothing of the production value that's obviously better in BG3. Still a good game, but the improvement between each of their RPGs is immense.
I have to say I very much prefer the combat system in OS as it feels much more natural and less restrictive than the DnD combat in BG3. Of course the latter has far more content, but I’m looking forward to Larian’s next game where they can finally go wild again and do things they want exactly the way they want.
I felt far more restricted by D:OS2's armor system. Freeform classes sound great on paper, but it also means you kind of naturally end up at a spot where you've got everything instead of making meaningfully difficult choices in classes or multiclassing. Learning abilities from books leads to a lot of money bottlenecks and leveling decisions that I didn't care for. The way that the combat usually doesn't have any chance to hit, but then does very occasionally, makes missing an attack feel like bullshit rather than a calculated risk. I'm also looking forward to whatever they do next, maybe even a sci-fi interstellar RPG, but I hope they don't go back to the Divinity well too often for RPG mechanics.