Just my opinion of course. I've played both Divinity:Original Sin 1 & 2 and Baldur's Gate 1 & 2. I have not played table-top D&D.

I didn't mind turn-based in DOS unless there were a large number of combatants. Then it becames very annoying to have to wait, while my PC got hammered and I couldn't do anything. I do like the idea of being able to set up the moves for each member of your party, while presumably the enemy does the same, and then play out the turn to see what happens. Initiative still plays into it because that determines the order. And on the other hand, going party member by party member allows the later members to react to the earlier attacks. Probably more realistic but is it D&D?

On the other hand, I found that I was doing a lot of pausing in BG if only to go after a new enemy. I'd also pause after a spell to set up something new as well as when someone died. BG was more frantic, but then I don't play shooters and my reflexes aren't that fast.

Which did I prefer to play? Probably DOS and turn-by-turn. But what is "true" D&D? I don't know.