OK, so while there are some superficial things that are like Divinity: Original Sin and Divinity Original Sin 2, since BGH3 is built using that engine, they play very, VERY differently due to the underlying game mechanics being so different.
BG3 has a much more conservative action economy and thus what you can do in a round is much more defined but easy to understand. This means the certain attributes are much less important, and you can build characters that are more focused. Plus you have a strict class system unlike the classless character build system that Divinity OS series had.
That said, combat is strictly turn based, rather than real time with pause like was done in older BG games, as well as NWN and Pillars of Eternity. Though in my experience for these games turned based is actually strictly superior way of playing the game, especially if you prefer spellcasters.
And I hear the waifus are ass ugly...
Only one of the waifus are not conventionally attractive... and that one is the setting equivalent of a gray alien, she's quite attractive... for a Githyanki (you can only do so much, they are humanoid but very off from normal humans) and she has an entire dommy-mommy vibe. The half-elf and Tiefling female companions are perfectly conventionally attractive, the half-elf having goth with a heart of gold vibes and the other being the sweetheart tomboy jock GF. Oh and for evil playthroughs you have the actually evil goth GF drow.
And if you're most interested in husbandos... well... you also have everything from the charming sparkly "I can fix him" vampire, to the sweetheart nerdy "I can fix him" wizard, to the noble "I'm a good boy with just enough edge to make you wet" warlock, to the "I'm not here for conventional relationships" druid.