JLA definitely wins. X-Men can't do much to them. Do you think Cyclops is gonna be able to hit Flash or withstand an attack like he did to Luthor? Wolverine isn't gonna put up as much of a fight against them as Doomsday did for instance. Storm would be one of the best adept to fighting these people, but even so, she isn't fast enough or durable enough to put up a great fight.
JLA win 9.5/10