It depends, honestly. I'd rather my sporty types be tallflats with toned tummies and thighs with big asses as a result of strong glutes. Huge titties are ideal on delinquents, gyarus, warriors, mommies, cowgirls, centaurs, and lolis. Especially lolis. I love oppai lolis.
Any other kind of bodytype, personality, or archetype I'm fine with big or small, but not flat.