I personally prefer deep-stack formats, because they are more logical so to say and predictable in a way that not everyone can just go ham on you. Those torunaments really show skill and heart and are to be taken more serious imho.
It depends on the person, slower tournaments worked for me. Not because I can chew the decision well that way, but because that's how I got to know the game, and I feel good here too.
I'm not really a fan of turbo tournaments. The fast structure cuts down post-flop play and turns the game into a shove. IT deep-stack formats where you can work your hands more