[quote=@Enarr]
Who do you guys think would win in a fight: Bizarro or The Joker?
[/quote]

If we're going with sheer raw power, Bizarro would reduce Mr. J to a fine red mist before Joker even knew he was there.

But assuming we account for DC's grand commandment of "Thou Shalt Not Ever Look Cooler Than A Gotham City Character," Joker would likely pull some plot-armor nonsense and mind-control him or something.