How do you like them and what do you dislike?
Personally I like small but "long" tits - the type that hang down if the lady bends over. I like to see them when looking down into a bra that's slightly too big. The type where you would love to slip your hand inside that bra and feel them. Lift them out.
My wife has small ones and now due to age they're a bit droopy. No matter though as when she bends over when I'm laying on the bed, they hang straight down, about four inches long and are so soft and floppy. Once I tea-bagged one of them and almost got the whole tit in my mouth.
What I don't like are fake tits. To me they all look awful. I don't like natural fat ones either - ones that fill the bra and bulge out of it. No thanks. I'll take tiny anytime. I once had a girl-friend with almost no tits but with puffy nipples. I would play with them for hours. She called them her "lemon ends". Too funny and she wasn't the least bit embarrassed by them. I like that in a woman! I wish I still had her.