Iceman or Hyperion or others to Rank 4

Hey guys, I finally got to the point where I can level up my first champion to rank 4 (thanks to the monthly rewards)... But I'm not sure who I should rank up first. I have a few people at rank 3 4*, Electro (duped), Cable (duped), Cap America WWII, Green Goblin, Iceman, and Hyperion!! Who would be the best choice to first ranking up to 4?? Thanks in advance for any help!
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Hyperion unduped isn't too god in attack, he can't keep his fury stacks long enough, so i went with iceman, the evaders killer