Answer:
the neck is very thin compared to the average guitar you may play, thin necks make you play faster and are better for people with small hands usually used by guitar shredders. Its a comfort thing and just like heavy or thin strings its preference.
there's 4 kinds of guitar necks
C most fender stratocasters and i've seen them on epiphone sg specials
D the average guitar neck, thicker than Us
U thinner than Ds , un-noticable to beginners how similar they are
V only seen these on Deans and odd custom shops
Ds I've seen the most on metal guitars, fast and easy to play
Vs you'll love if you got small hands but like Ds and Us
Cs if you're starting out but once you're 20 or so and your hands are bigger you'll love Ds and Us, but thats not to say you wont like them right off the bat, I hate Cs