I usually play in real time, for efficiency.
It would be endless to farm, pvp or travel on worldmap if everything was on turn-base.
But when you play with mates in pve, i think Turn-base is more entertaining. It allows you to care about every action of you mates and ennemies, to make fun of them, or congratulate their last move, to talk about random things etc...
It is even better if you play with people that aren't progamers. Their action are impredictable, refreshing.
While real time is about efficiency, Turn-base is more about enjoying the moment, every gestures for itself.