Cosmic Rank-Up?

Which Cosmic champ to Rank up? Already ranked up a 4 star Venom and wondering who to go for next.

Comments

Don't bother with Pheonix. She isn't as good as the other two.

Corvus and/or Proxima

Medusa

4* Medusa unduped almost got me a solo on 5.4.4 Ultron on my first run. Not one to be underestimated.