Welcome to Gaia! ::

Superman wins:

Juggernaut since his de-powerment and
recent RE-powerment, has regained his
class 100 strength capabilities.

However, his more susceptible to fatigue
and he can be injured far more easily
prior to being depowered.

Superman, on the other hand, is far from
having to worry about fatigue especially
within the Juggernaut's "several days"
limit. He's always been nigh invulnerable
and more importantly, still is, being able
to survive low yielding nuclear explosions
and MULTIPLE ONES AT THAT along with
ten megaton detonation bomb with being
knocked unconscious the only consequence
suffered. Superman even withstood Darkseid's
Omega Effect.

In short, Juggs can dish-out A LOT more than he can take in.
PLUS, Jugg's reflexes aren't quick enough being even slower
than the Hulk's.

...

I also must say that guy must have been smoking chingos of weed
to think Thor doesn't stand a chance. Thor has handed the Surfer
his a** on several occasions, something Superman himself would be hard pressed to do.

I'm going to agree with Kuroudo Akabane that Jugernaut loses, if for no other reason than he's just too slow.

Keep in mind that at Superman's speed levels anyone even remotely CLOSE to human limitations in action/reaction time is going to have a hard time getting so much as a hit in unless they have some MAJOR tricks up their sleeves. Even if Jugernaut does have greater levels of invulnerability (something I wouldn't know, as my studies of the Marvelverse are far from absolute) it wouldn't really matter... because he has no way to get any hits in.

Unless Juggernaught can fly/teleport (which I'm fairly sure he can't), Superman wouldn't need to. Being able to relocate a person to a place where they are essentially incapacitated (such as leaving them on the surface of some featureless asteroid, etc.) is generally considered adequate to count as victory in a VS debate, unless I'm mistaken. Or, to put it another way "It's not about beating your opponent into unconsciousness, it's just about beating them."

Your point about him hitting speedsters is deffinetly valid, though. I'm not sure what said people were thinking, but while travel/movement speed often has a rough correlation to action/reaction speed, they are NOT the same thing. It's perfectly feesible that Jugernaught is able to move his arms allot faster (and coardinate his punches allot quicker) than he can move his entire body. And if he was hitting a top speed Thor, then it sounds like he IS doing that.

You would think the fight would go down a litle like this...

Superman flies in....

"Give it up, big red"

Puffs up his chest, gets all heroic looking......

"Alright tough guy..."

Juggernaut throws himself fulls speed into one massive punch.

Here's where the fight gets all fuzzed up.....

Assuming we go with pre de-powered Juggernaut, who MANHANDLED Thor and the Hulk, then I'd say Supes is in for a world of hurt because realistically (as close to realistic as we can come) Juggernaut's power is magical in nature. Superman's invulnerability shouldn't come into play, just as in a fight with Thor one swing of Mjolnir should kill him instantly. Juggernaut should crush his body in with the first punch, if the attack is inherently mystical, wich I believe it is.

And trust me, I would want nothing more than to have superman actually dead. But they built him up so much that he doesn't loose given the oddest and extreme circumstances.

I disagree. Although Jugs has a magical defense he can't punch through superman. His fists are protected by magic, they aren't projecting magic. Now Jugs has shown alternate powers, ak( levitation, teleportation and used his shield to knock people around. But one hitting Superman is ridiculous. Has Shazzam one punched Superman out? Nope. Did Superman die when hit by his lighting bolt, which is magical. Nope. So superman is weak, not totally defenseless. And if the no magic defense played a part then the Hulk, who has no magic defense, would have holes in him. And the Hulk can take a punch from Jugs. Since superman is tougher than the hulk(as in can take a stronger punch) he then can take a punch from jugs. Some would agree that doomsday can stand up to the Juggernaut. Since they are very similar ak (don't need food, regenerate quickly, unstoppable) and Superman can hold off Doomsday he should be able to hold off Jugs. Doomsday is unstoppable and relentless. No talking, no mercy, two things which Juggernaut does do and have. Juggernaut also is cocky. He thinks he can one punch most people. He would one hit Superman and then start to walk away.
Now I am not saying that superman would win in knock down fight. But superman is faster. he would win just by throwing him into space or dealing with jugs just as he did doomsday. Since this forum does deal with character stupidity or what they are expected to do, then superman would be able to defeat Jugs. Juggernaut is not stronger(in weight lifting), not faster, can't consistently fly, not enough experience in dealing with a character like Superman, and less intelligent. Juggernaut relying on his magic to defeat Superman is not enough to take down the man of steel.

Unfortunately the lack of magic resistance is NOT something that Hulk and Superman share. Hulk's invulnerability and regeneration are applicable against magical attacks and Superman's are NOT. Superman has been cut by the slightest contact with a magical weapon before, and a MAGIC field slamming into his chest with 100 tons of lifting power behind it should collapse his rib-cage pretty nicely.
Remember, Invulnerability changes pretty drastically between characters. Shazaam's lightnig isn't necessarily magic in nature, because if it were it should flash-boil superman's blood. Thor's lightning should kill him instantly, as should any blow from Mjolnir. Hell if he played his classic tough guy fight opener the Black Knight should be able to cut him down pretty easily.
It's not that ALL invulnerability fails against magic, because most of it doesn't....but Supes' does.