Whomever youre best with. Youre nearing or are already at the point where you should be able to regularly complete master difficulty and 100% heroic EQ's. Once you get to, or perhaps you are already at, this point, you need not worry ranking up champs individually as you T3 class catalysts will come pouring in. Personally, I would try to get at least 1 Tier 4 basic per week through arena and prepare for the 5*s you will eventually get once you get to the next milestone in your progression.
But if youre really good with Quake, Hyperion, SS, Havok, or Nick Fury, rank those up first. If not, then dont fall into the trap of ranking up someone based solely on reputation
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But if youre really good with Quake, Hyperion, SS, Havok, or Nick Fury, rank those up first. If not, then dont fall into the trap of ranking up someone based solely on reputation