I’ve played Starfield for 30 hours and I’ve played about 10 hours now of BG3.
The difference is remarkable. As far as RPG goes, BG3 actually gives you a way to do the role-play part of RPG. You just have so much choice and your choices have consequences. For example, it turns out, someone died because I left an encounter that I wasn’t prepared for and that came back on me later when I found a guy that I should have had a quest line with.
You have relationships, you can choose several ways to approach problems and quests, and the character building is huge. There’s real strategy to everything.
Starfield is just so bland in comparison.
(BTW, BG3 combat is real difficult early on, where I’ve had to save scum just to make it past some fights, but at lvl 3 it gets more manageable. Definitely take time to learn your party’s strengths and weaknesses.)