i think ass wins, but i love a set of big round perfect tits. i guess a nice ass is easier to come by. lots of girls have nice asses. tits are all over the map. they can be big but droopy, small but perky. tiny nipples, big nipples, flat, puffy, dark, transparent, ovular, circular. but god damn when you find the perfect combination of size, shape, and nipple.. it's just a thing of beauty.