Yet another Rank up question,4* R3 to R4

GQuantao

Choices of 4*, all unduped: Iceman, Mordo, Ultron, Crossbones, or a duped Hawkeye.
I've also got 5* unduped Storm, Ultron, Antman, Juggy and SIM just at R1, but still think one of those top three 4*'s would be the better choice

vinniegainz

Iceman or crossbones or 5* ultron (does not need a dupe)

Edit: sorry I still didnt give a single choice because it would depend on your needs, do you have an ability reduction champ? (Go CB if no) Do you have a AQ or general quest regen champ? (Go 5* Ultron if no) Do you have an all around good attack champ? (If no go iceman)

Iceman tanks sp3s, stops evades with coldsnap, triple immune, and good dps