RTwP has a steeper learning curve but once you become very fast at pausing/unpausing it is very deep and rewarding. PoE2 developed a great RTwP system that would have suited a Baldur's Gate better than Larian's brand of turn-based combat.
In DoS2 the amount of time it takes for enemies to take their turns is unbearable, made me quit the game halfway through. All Larian has to do is give an option in the menus to speed up combat, like in Heroes of Might & Magic. If they stubbornly refuse to do so then it says a lot.