Why are バットマン and The Joker such great opponents?

I think it is that they are polar opposites, but like a magnet drawn to eachother out of for the Joker amusement and バットマン for duty..Batman on the opposite side reasons and believes in justice while the Joker never reasons and mocks goodness..He is maniacal and without what most deem as reason または remorse so they work well as perfect opponents who without the other would have nothing to challenge themselves with...Heath 発言しました it best when dangling..and I won't kill あなた because you're just too much fun! ....