i have an idea...lets see both of yours and ill tell you.
jk.......or am i???
but i this is a tough one. i agree with the guy above me who said, "an ass is a nice visual, but boobs are a nice toy". it all depends on what youre doing with the girl: just looking, or fucking.
looking: ass wins
but you cant have a great fuck without some titties bouncing around, and when youre in bed, youre not looking at her ass...