Help Which 7* champion should I take it r2 and r3 using rank up gem

I would appreciate all of your help and input on who to rank up I have a generic 7* r1 to r2 gem and a romance r2 to r3 gem I’m not sure which Champ should I rank up I have a very small 7* pool to choose from . I am considering a champion for war attack and end game content like necro , epoch but don’t know who is suitable 



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Comments
Do you need an evade counter?
Do you need a miss counter?
Do you need specific immunities?
However, if you’re running Act content. Advance as far as you can until you get a roadblock, whatever that roadblock is rank up the champion that clears the path.
There are MVPs for chapters and bosses. I suggest you look at content creator guides on you tube.
Howard is after you