I read the exiles book that youre talking about with hyperion. That hyperion would destroy superman with no problem. That guy killed the avengers, x-men, and fantastic four at once ending with his breaking thors neck. Then it was stated that he killed galactus without any effort. Thats why he beat holocaust, hyperion was considered unbeatable and if you keep reading exiles you will see more of his power.
Hyperion tapped into more of his power making him like a god. Hyperion in the exiles version would destroy superman, with the power they were showing that he had in the comics, he might have the power to kill the entire jla.
Back to the fight, I dont know who would win, holocaust is a great fighter and he is completely invulnerable with no weaknesses to physical attack and he is in the 100 class range in strength and has great speed. Superman fans please dont say that his punches wont connect because if batman had superstrength and durability he would give superman a run for his money. but good fight, i think holocaust wins sense he reminds me of doomsday added with a powerful blast.
That hyperion isn't that tough blink and gambit beat him. The exiles will beat him again. And there is no way he can beat the JLA. He killed alternate timeline avengers most of the alternate timeline characters or not as strong as the prime time line counterpart. I mean he killed a hippie hulk. How strong could hippie hulk be?