Mutant rank help

Mentalboy1

I have decided due to having more mutant tier 4 cats to rank up my mutants. My top champ so far is 5* iceman rank 4 can't rank 5 him as not got cat5 yet. I do have good 4* champs mutants too like sunspot, wolverine, sabretoth, collosus Emma frost, but feel better to rank up 5*. I don't think red Cyclops is worth it but included him in the poll.
Also interested on why choosing as I'm torn between rogue and storm.

Crcrcrc

If you can save them, do it. These champs are not better by far than colossus

Ciciliato

Rogue 5* rank 2 duped

Rogue helped me a lot for act 5, not the best damage but good sustain, power control and ok buff steal

KingKevin

Rank 4* colossus or sunspot

Mentalboy1

Thanks all, I'll max collosus then if he's better then see what is spare

Thicco_Mode

I'd rank 4* colossus