Which four star should I upgrade?

Greatness_12

I have several four stars I should upragradr but I don’t know what ones to upgrade first. You guys have any tips on these champs?
Drax
Phoenix
Magneto (Classic)
Nebula
Star-Lord
Falcon
Thanks guys!

DoctorJ

Any awakened?

Greatness_12

Nope

HeroBoltsy

Star Lord for sure if he's awakened. Absolutely incredible for endgame.

Greatness_12

I’ve beaten act 4, I want to upgrade star lord so I can awaken him but I have other good champs too