

I'm fairly a new player, been playing for 3-4 weeks now. Recently finished completion of act 3, looking forward to act 4 now. And I have a few questions about my champions.
-Which 4*s and 3*s should I focus on ranking up?
I have a 3* duped Namor and heard he's one of the best mutant champions, but do I use bishop over him?
-Who do I use for questing to act 4? AW (defense and attack)? AQ?
I also pulled 4* red hulk thanks to act 3 completion rewards, will he be of any use?
Info: Both hyp and wasp are r4, and Thing is r4 too
GR is r3