Is there one genre that's easier to write than others? Perhaps I'm wrong, but I think many people (not writers, generally) believe that writing chick lit is easy. The same likely holds true for YA, romance, children's books... and the list goes on.
I don't think that's the case. At all. (Insert vigorous head shaking.) Every genre has its rules that you must at least be aware of, if only to break them. With YA, I suspect writing in a voice that appeals to the younger generation is as difficult as putting on eyeliner without a mirror (it's hard. Try it). With chick lit, keeping the pace quick and light yet inserting just the right amount of depth can be a killer. And while I don't write children's books, I'm in awe how well-rounded stories are crafted in so few words.
It's not easy. Nothing about writing is easy. So there!
(I realise I'm preaching to the choir here, but I feel better for getting it off my chest!)