Honestly I'd do Rogue. Iceman is already a fantastic champ without the dupe, and he doesn't need it to wreck in AW. Rogue kinda depends on her dupe for her power and health steal to be great.
Rogue: When awakened, she has some chance to steal more life. It doesn't happen all the time and it's not that significant for the fight. It's nice but not important.
Iceman: it will start with coldsnap causing damage, preventing evade and making the ice amour quicker. It helps a lot in fights, in my opinion.
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More general all around utility, and anti-b.s. like evade or A.I. that refuses to use specials, iceman.
I used it on iceman.
Rogue: When awakened, she has some chance to steal more life. It doesn't happen all the time and it's not that significant for the fight. It's nice but not important.
Iceman: it will start with coldsnap causing damage, preventing evade and making the ice amour quicker. It helps a lot in fights, in my opinion.
And a week later, pull a 4* wolvy.
Send some lols my way