Mutant Rank up advice

I can take one 6* mutant to rank 3.. I'm currently TB.. looking at Completing Act 7 and also play all other contents.. I'm torn between Stryfe and Colossus... I like stryfe's playstyle and have seen him clear shorter fights and AW also with ease. And I haven't played with Colossus yet.



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Comments
He will get you further than either of the mutants, even as a 5*.
He should be ur next R5 target