Silver Surfer prime Vs Thor prime
Silver Surfer in his most powerful state, either it be keeper, or uni-force Surfer, fighting against Thor in his most powerful state, runes, ascended, and so on. In a battle untill only one is left in existence, on a barren lifeless world; no rules no holding back, both blood lusted, and both utilizing their abilities to their fullest.
The keeper is arguably greater then or equal to king Thor, as the keeper is also arguably greathen or equal to galactus. I have not seen what Uni-Force Surfer can do, but I imagine he would be very powerful with a vast gain in knowledge, abilities, power, and fighting ability due to becoming one with the uni-force. I never read the recent uni-force mini series, does surfer merge with the uni-force? Does he do anything well merged with it or does the comic leave it un decided?
By the way to back up what I said earlier about the Keeper being greater then or equal to Galactus; during the two comics in which the keeper was shown #24-#25 (DotU) the keeper defeated a weakened galactus, but being that galactus was weakened it doesn't give a accurate scale or reading of how powerful the keeper trully is.