Which mutant champ to rank up?

So recently, I pulled many good mutant champs like 4* Omega Red, 4* Domino, and 5*Archangel.
Among them, which champ will be more worthwhile to rank?

Comments

Only rank 5*s going forward, 4*s are dead

Unduped 5* AA mostly because it’ll be more useful for act 6 with the 4* restrictions

5* AA will be relevant in all content at some poiny in a path, and I will save you serious units when he’s absolutely needed.

Thanks for the input! I guess I'll go with AA