Who should i upgrade

So here are most of my 4 and 5 star champs. I have enough cats to rank up what you see but will have enough to rank up anything after the next AQ rewards come out. Really just looking for advice on who to focus on. Should I bring 4* r3s to r4 or r4s to r5 first. Or bring up my 5 stars even though they aren’t great champs. OR lastly, save all the cats and wait for a better 4/5 star pull






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About the 4 star, Hulk Ragnarok, Killmonger (and hence Winter Soldier), Wolverine (when you’ll dupe him), Venom, Vision and Corvus are those who are worthy for the rank up.