This is provided there were clones of Barney, Hooky, and Steve so they could fight for both bands...or something like that. Use your imagination. Hard to call....
Joy Division does have the extra man, but Gillian could fight dirty (and get away with it since she's a woman) and put Ian in a stranglehold (hmm...bad joke) and then JD would be a man down. But if the New Order of today fought Joy Division (of the past, of course), NO would suffer broken hips and strained backs. Besides, Ian's dancing could be like drunken boxing in a fight...them limbs are moving hella fast.
I don't know what's the greater question: who would win, or whether this post is the dumbest ever.