Do I even need to give a reason~?

Gotta say that a fine ass pulls my eyes much more than breasts do. BUT smaller breasts all the way.

since i like em young, FLAT

I prefer a mix.

Tig ol' woomies!

So.. One big titty one small titty?

One cup size like half a watermelon, the other one like a martini glass

Either have a set of fat milkers, or stay flat as a plank of wood. I see girls with small tits who try to act like they have tits by pinching them and groping them and it just looks insecure.

Big boobs but it sometimes depends on the artist

Well, to use League champions as reference points, I'd say no bigger than Syndra's and no smaller than Neeko's.
I'd say I much prefer smaller ones though. :3

I certainly don't mind small breasts and can find them just as attractive, but I gotta say big breasts are my preference. In particular Anri Okita's boobs before getting pregnant was the perfect size and look to them in my opinion.