lol so many pages! obviously i didn't read all of them, so i'm sure i'm repeating this but anyway...
the picture that venomfan posted is from an issue where the professor hulk runs into juggernaut in the rainforest (i forget why he's there). juggy is working for the red skull and he's tasked with bringing the hulk in to be controlled by mentallo (who is also working for red skull). juggernaut poses as a forest worker (he's driving a bulldozer when the hulk encounters him) to trick the hulk. for some reason they start fighting and the hulk isn't taking him seriously and keeps telling him to stop before he gets hurt. hulk eventually realizes something is up (way later than he should have! after the first punch, you'd think this hulk would have recognized that thies guy wasn't human). but by that time, he's taken enough punishment so that the juggernaut is able to headlock him and knock him out.
ewhen hulk comes too he's being restrained by red skulls technology and hulk starts taunting juggy to try to get him to attack and break his bonds. red skull talks juggy out of retaliating and juggy says something like "but i can take him" and red skull humors him, it's funny. anyway, hulk claims that juggy could only beat him because he tricked him.
eventually mentallo manges to control the hulks mind and hulk and juggy actually fight together for awhile! it's sick, the avengers come and they get devasted. vision almost takes juggy out by phasing his heand through juggy armor and literally fingering his brain, but the hulk crushes vision before he can do any real damage.
eventaully the hulk regains his mind and the 'psionic' force of the regaining knocks out everyone in the vicinity (i think it even knocks juggy out through his helmet). hulk has lots of psychological issues 🙂.
so, at least when he tricks the hulk, juggy can beat the professor hulk into unconsciousness (i'm not sure what could have killed the professor hulk, thanos (thanatos?) was the only guy i ever saw that actually did kill him. some super villian once blew almost all of the hulks skin and muscle off with a telekenteic force (he was almost just a skeleton!), and in about 20 secs, he had regenerated all of his body.. so he's definitely a tough bastard.
imo, if he was bale to get juggy's helmet off, hulk could beat him.. but it'd be a badass matchup 🙂