I know I am saying this as an English speaker BUT I generally prefer a game's audio to be in its original language (which is the opposite of my preference with anime weirdly enough), cause often times I feel like that is the language that had the most passion and work put into it and often times I can hear it. For example I set Sekiro to have the Japanese voices, not cause the dub was bad because the dub was really good, but because I really liked the emotion in the original Japanese voice acting. If BG3 was originally designed to be in French, I think I would have preferred it sent to french for example.
That said, my preferences are my own and I absolutely welcome the idea for there to be more language choices for voiceacting so the game is more accessible to others.