To me, t-girls are just like regular girls: I like them in all shapes, sizes and styles, as long as the whole is visually pleasing. I think the tiny boob look fits some ladyboys perfectly, while it may look weird and too masculine in others.
IMO, the "teenier" a shemale looks, the sexier a tiny tits look feels. Girls with an "I'm a sex animal and I want you tonight" look work best with round, juicy ones