I love the crunch, and it's rather succulent in comparison, while eating oak leaf, frisée or especially Lollo Rosso feels more like stuffing an Elizabethan ruff down your throat. Iceberg is also easier to get, store and handle than all the others (bibb gets bad quickly). Don't really care much about nutrients, but I read that iceberg has lots of vitamin A.

Don't get me wrong, I don't dislike the others. I love arugula/rocket in particular.