Cut.
I don't know that I've suffered any adverse side effects from it, as my dong seems pretty healthy, just not large enough. :D
This is nothing more than personal opinion, but I think that a cut penis looks more attractive and I think this is the opinion of many cut men and women that have only been with cut men. I don't see myself pursuing any foreskin restoration because the main benefits (the nerves) have been severed, so it would be mainly for appearance.