I actually find both Pathfinder games very rewarding in terms of balance. Just when I am starting to think I'll just use the same tactics again, the game throws some crazy new enemy at me and I'm trying to figure out what works on it. I especially like that there are SO many more monsters, and the monsters are at appropriate levels, typically.
But, I will say this. The last couple of times I played BG3, I REALLY enjoyed it. It's definitely getting better and better. And little things are getting implemented - like they listened and changed Imps to Lesser Imps in order to explain why they don't act like typical imps and are weaker. It's those little things that we tend to overlook that they are doing. And they did fix some stealth things that were broken, indicating they are working on it.
Anyway, the point is that I love WotR and Kingmaker, but there is still just something about BG3 that really hooks me. I don't know why exactly, but every time I see even the icon, I want to play it. Yes, Pathfinder is awesome, but BG3 still wins out for me, even with all it's little "flaws".