Who should I rank up?

Cap45

I have r5 red Gaurdian, and r4 versions of Hercules, cgr, kitty pryde, tigra and kingpin. I have no tech at the r4 or above level so I was thinking infamous iron man, but I also have a Photon which would be a good defender for battlegrounds or war. I’m also looking for a strong champ for story progression. Who should it be?
(Also both awakened but low sig)

Rayven5220

Photon

Photon. She's actually a pretty decent attacker as well.

I doom is a decent champ, but mostly used as a counter to bishop and a few other niche mutants.

I have mine at r4 and I rarely use him otherwise.