Well, one is a linear, turn-based, 3rd person party cRPG.
The other is open world, real-time, 1st person with optional followers, sandbox action-RPG with space shooter elements.
Utterly different animals and any comparison is as invalid as comparing BG3 to Elite, DCS or RaceRoom. I've no interest at all in BG3 because turn-based party RPG-s are not really my jam. And I've never cared much about story-telling, either. I like good worldbuilding, sandboxing, looting, crafting, trying different builds, doing whatever the hell I like at any moment while completely forgetting that something called "main quest" exists, getting technical and modding the crap out of a game and this is where Bethesda shines.