Goblins got superstrength and high tech weaponry on par with Bats. Joker's got acid, gags, and a bad plastic surgery job. I don't see how Joker would take this.
Hmmmmm i would usually say Green Goblin, but i just watched Batman Beyond The Joker Returns and realised that Joker OWNS ALL...... so with a smile on his face and a razor sharp playing card through the Goblins heart , Joker wins
The Joker: I've been dead once already; it's very liberating. You might think of it as... therapy.
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The Joker: [reciting his poem to Vicki] I'm only laughing on the outside / My smile is just skin deep / If you could see inside I'm really crying / You might join me for a weep.
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The Joker: Tell me something, my friend. You ever dance with the devil by the pale moonlight?
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The Joker: Now comes the part where I relieve you, the little people, of the burden of your failed and useless lives. But remember, as my plastic surgeon always said: if you gotta go, go with a smile.
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[the Batwing is flying at Joker]
The Joker: Ah, come on you gruesome, son of a *****! Come to me. Ha ha, come on!
Green goblin. Super strength, stamina, one hell of a healing factor, madness, brilliant and lethal weapons and inventions, not to mention a well connected billionaire. And the man can hold a grudge for ever.