Big {not huge} butt and small chest. Can't say why on the chest. A big butt is just so much fun and looks great. I'd append that it's got to be a fit butt.
Big does nothing for me. It's all about the curvature and bounce for both booty and tiddy.
Honestly though if she's nice to me and I'm in love with her it doesn't matter at all. I dated this chick with huge boobs and no ass and she was amazing. Unfortunately we had intellectual differences that I couldn't get over so I had to end it with her. But she was super sweet and the fact that her body type was nothing like my "preferred" didn't even matter.
chest can be any size, but I prefer some ass on a woman. literally no ass would be better than any injection though. fake asses look weird and they're not worth it.
of course personality comes before anything. anyone can be hot if they carry themselves a certain way.
My girl is big chest and small ass, but to be honest I've always preferred big ass, the sight in doggy must be awesome. Still I love my girl, her tits are delicious and also give a good sight when she rides. I've become a tits lover over time haha
A beautiful person is a beautiful person so I don't think I can say I have a serious preference as it's always a total package situation for me. I guess an actual answer though is that a large chest is are more fun to play with, but a nice ass is more enticing on a carnal physical level. I'd probably say I lean more on the boob side personally.
I have the big titties as well. Actually helped me hook up with a girl once. She had said that she was actually looking for someone with big titties that day. I pointed out mine and thus sealed the deal.