KAD said:
			
		
	
	
		
		
			Equal would be a stretch.
 
Onslaught would be the closest approximation to Xaviers full potential and None of the JLA are up to taking on the big O. Nor are the X-men for that matter.
 
 
I love both teams and 9 out of 10 times the JLA hands down.
But to say that they couldn't win is unrealistic. 
 
By the way are we sure Supes wouldn't be cut by Adamantium?
 
By the way 2 couldn't Rougue steal all of the weaker Jla members powers and half of the big hitters?
 
Couldn't Xavier alter the Jla's perception so they were slightly behind in reaction time. This not being an overt attack by Xavier, wouldn't be detected for some time by MM.
 
 
Besides Batman the JLA aren't really tacticians. They rely on the big guns.
 
The X-men are almost always the underdog and are always forced to think to win.
		
		
	 
 
Martian Manhunter effortlessly solo'd most of the DCU Earth as Fernus The Burning, and was only halted by the nigh-omnipotent Plastic Man.  He's also, without any difficulty or extra equipment mind you, scanned the minds of every sentient being on planet Earth.  Saying that he's in Charles Xavier's league is a disservice to the Manhunter.  Professor X is lucky that he's barely in the Martian Manhunter's league.
 
As to adamantium not working on Superman, the explanation is simple.  Wolverine can't cut through force fields.  Superman's body is surrounded by an impenetrable force field generated perpetually thanks to the solar radiation his body drinks up.  Failing that, Superman's skin itself would be impervious to Wolverine's blows.  Why, you ask?  Let's look at what has cut Superman.  To the best of my knowledge, two things have ever cut Superman; Doomsday's bone claws and Wonder Woman's sword.  Wonder Woman's sword was forged by Hephaestus and can cut the electrons off of an atom.  It is thusly magical, one of the few things Superman is weak to.  Doomsday's bone claws cut Superman becauce Superman's body was too drained for the force field to be kept up, and Doomsday had sufficient strength to do so.  I'm waiting for the arguement that Wolverine is as physically strong as Doomsday, because that's the only was his claws will have a chance at cutting Superman.
 
As to Rogue stealing powers, how?  She can control fire, currently.  That's nice and all, but she doesn't have nearly the speed to be able to deal with the JLA outside of, say, Batman and Aquaman.  And without her Ms. Marvel powers, it'll be a cold day in hell before Rogue takes Aquaman.
 
The JLA don't have tacticians?  Have you read a JLA trade?  They've got Batman, sure, but then they've got the Martian Manhunter.  The Manhunter, you'll recall, was able to unify the Avengers and the JLA against hte deadliest threats either team had ever faced (including an army of Doomsdays and Thanos of Titan).  Besides that, J'onn's mental shielding has survived plunging into the minds of demons and 
effortlessly penetrated the mind of the Spectre and the JLA simultaneously.
 
The X-Men are the underdogs, sure.  But if the JLA has reason to consider them a serious threat like, say, the Crime Syndicate, there's no way in hell a Phoenix-less X-Men stand a chance.
 
And even if you add the Phoenix Force, it becomes the JLA v. Phoenix, and not JLA v. X-Men.