Joker vs Batman - The Scales Aren't Equal
I was unable to sleep last night, and for some reason I ended up thinking about this...
Joker vs Batman. We've seen it a bunch of times. Joker always gets a few hits on Batman but he's obviously not his physical equal. But think about it...Batman, almost always, BARELY is able to stop Joker's plans. Then he precedes to just pummel Joker and lock him up.
Joker is smarter than Batman. If it wasn't for Batman's physical prowess, he'd lose. They're equals in the sense that they're a balance of good and evil, and that they're rivals, and even that their sanity scales are balanced (Batman is mostly sane, but a little insane obviously. Joker is mostly insane, but obviously sane enough to be a genius.) The only thing that separates Batman from Joker in their fights is his strength.
People always say stuff like "How could Joker ever take down *insert any hero with a superpower* if he has no superpowers to fight back with? He can't even take down Batman who is just a normal man." - Joker proves himself time and time again to be a total genius when it comes to his crimes. Granted some things are PIS but you know, that's always a factor once in a while.
Essentially, I'm thinking...Joker is actually better than Batman. The only two things that are stopping Joker from killing Bruce for good is the fact that Joker isn't as physically strong as Batman, and Joker doesn't want to end the game that they play.