I generally want to hear the truth, except when it belittles my partner. I am a pretty smart woman, and a lot of guys are intimidated by my intelligence. I hate hearing from a guy how much smarter I am than him (I had one boyfriend who did this constantly). That's not a compliment. I also don't want to hear that I'm prettier than your ex-girlfrriend--I don't want to be compared to the ex in any kind of way.
I want to be me, and I want them to see me for that, and compliment me based on that fact. I want them to say "You're beautiful" and mean it from the heart. I want them to tell me I'm weird with a laugh, because yeah, I am weird
but then I want them to tell me it's okay because they're weird too.
I also don't really like compliments about my stomach--some guys like girls with bellies, and I have one, but I don't want to hear how much you love it. It's a part of my body I'm not comfortable with, so let's just not talk about it.