Batman actually is a really good dancer. So is Hal:
Bruce goes dancing all the time in his billionare playboy routine. He has to. And Hal used to take Carol out dancing like, once an issue. He still goes dancing pretty often. I see him doing a mean samba or tango. Batman probably has more of like straight up ballroom skills.
Clark, in my imagination, cannot dance: Louis probably can, but Clark going up always had trouble with girls and I imagine he's not all that self-confident on the dance floor.
I've never seen Wally dance. I imagine Bart could probably dance pretty well though.
Noted comics blogger, Scipio, has this to say about the Martian Manhunter's dancing skills: In a post titled
"I'm not saying he's gay, exactly...
... but, have you ever seen the Martian Manhunter dance?
Okay, you straight people may have never seen this sort of thing, but J'onn's what we call a 'dervish', one of those guys whose idea of dancing is twirling around in one place on the dance floor. Not one cool little Jackson 5 turnaround in the midst of other dancing. No, no. We're talking spinning; Stevie Nicks, Tonya Harding, Tasmanian Devil kind of stuff."
Observe:
No, really. The god-like Manhunter with a million powers, often decides that twirling is the best response to his problems.
And in this last one: "sound effect, or editor's note? You decide."
So, in conclusion, Aquaman wins. Dancing is part of the training for Atlantean noblemen. Didn't you know that?
With this thanks to Scipio at the Absorbascon (http://absorbascon.blogspot.com) for the jokes I quoted.