I guess it depends on the crowd. I personally don't know anyone who won't "git own up!" and dance to the sound of "Sex Machine."Fine by me. Having played both at the proper tempo hundreds of times (using a drummer who clicked off every song with a metronome) I can tell you that Funky Music got them slammed up against the stage dancing and Get On Up sent them to the bar more often than not.
But that's anecdotal at best. I concede that point.
Get On Up is fun and funky to play, but (in my experience) hasn't translated to full dance floors, and even rather the opposite at times.
Also, "Play That Funky Music" was a bigger and more familiar mainstream hit.

