Which 5* cosmic champion is worth r3?

SassyMasty

I got a r2 --> r3 gem from completing act 5 and I would like to hear some opinions on who is worth r3.

I am leaning towards hela since she has synergy with my team of 5* corvus, 4* proxima, 5* thor ragnarok, 5* hela and 6* ghulk.

The champion also seems cool...

_Chaos_

The Champion

Rockypantherx

Angela or Hela for me

Fhfjghhggggjfhfjg

Angela or hela are the only ones worth using it on