I'm going to be unconventional and pick 2 because I actually love her smaller tits and she's got that gorgeous long wavy black hair that is UNF oh so god damn sexy, good lord!!
4, for the buoyancy. I'm not into swimming, so I know if she's around she can get us to shore.
Why the fuck I'd ever be in a situation where I need to get to shore without a vehicle, I'll never know 'til it happens.