I vote crested- they are adorable, and very simple to care for (no heating/lighting required, simple diet). It's hard not to like them!
I don't have personal experience with the other species. I know gargoyle care is very similar, if not close to exactly the same as cresteds. I do love the way leos look and maybe I'll get one someday
I 2nd that... We have 2 cresties and they are BLOODY CUTE!! My 6 year old daughter takes care of them too.