I particularly prefer RTWP because I don't like having to manage more than one character. My goal is to play a character who is part of a party, not to play with the entire party. That's why the possibility of having 6 characters in the game is a nightmare for me.

But on the other hand, turn-based combat suits perfectly with D&D – much more than RTWP. So, in my opinion, BG3 is much better with TB. To implement RTWP, it would be necessary to have a very, very good AI for the other characters in the party (something similar to POE Deadfire or DA Inquisition has).