I'm just suspect of the OP's "research", I mean how would a person even get a reliable sample to make any statistically conclusive inferences.
Anyway, I'm with the chick who said real tits are preferred (but only if they are nice and perky w/out salami nips -- for me at least), but fake tits look better.
At the end of the day, I'll take a chick with a really good boob job over a girl with average tits. Unless your naturals are just fucking immaculate, I'll go with fakies -- I'm a superficial guy and they just look better.