what exactly have either of these juggernauts done that's so impressive?
people really do go ott with the juggyfanboy thing 😐.
if one's possessed by cyttorak, then that's hardly "juggernaut", yet still... Hulk's proven far far more powerful than cyttorak's magic charms (the Bands of Cyttorak, juggernaut's "unstoppability"😉 and gone toe-to-toe with Onslaught who juggernaut could not even stand upto for a panel.
this quite likely goes to the Hulks in the end,
Actually that isn't 8th Day Juggernaut tearing through dimensions. That was during the Trion incident.
During that event Juggernaut was neither possessed by the Trion or Cyttorak. It was another entity accessing more of Juggernaut's own power. It was a random character that had a beef with the Trion. I think his size growth was a side affect of the dimension.
As for the 8th Day incident, Cain fought with Stone Cutter and it was said to be the fieriest battle on earth. It rocked the earth, unlike WWH and Sentry who only tore up a city, then Hulk stomping the ground shook the eastern seaboard.