that'd be a hell of a battle. i think juggs gets the edge in strength and invulnerability (though marvel is also nearly invulnerable) but marvel gets speed and flight. i don't see how marvel could knock juggs out though, unless he can implement his little understood magic lightning. toss up here i say, with maybe the edge going to juggs 6/10?
I'm going to go with Captain Marvel on this one, due to speed, flight, brains
as well as being almost as tough as classic Juggernaut. He's have a hell
of a time hurting him, but could find a way to take him out of the fight.
Perhaps lift the ground beneath Juggs and fly way up and drop him in
an ocean or put him in orbit....
Great colorful fight this would be!
Juggernaut is too one dimensional to pull off a victory over Shazaam. CM will not hurt him but he could mobilize him somehow for a victory. Juggernaut has about the same chance as Hulk beating Superman which is slim to none. Thor couldnt even beat CM, he had to get a cheap shot in while he was Billy Batson to win in the crossover.