For me it's not really a matter of what I like, I'm 34D so I need to support them. I like triangle bikini top but I can't wear them, I also like bandeau but I would never be able to wear them. I like retro top, they look sexy and support everything. I take a regular bottom. When I was younger, I used triangle and I loved it.
I have small boobs, (34A) so I wear a triangle top, but that's just because that's all I can find. Bandeau's always fall down on me. I am looking for sporty two-pieces, because I'm fine showing tummy but two pieces always fall off me, especially tops. :(