Which 4 star to take to r5?

MountainDew69

I've already become uncollected and have t4 basic and t1 alpha in overflow. I have trash 5 stars ( Ebony Maw, Vulture, Superior Iron Man and Magneto) and need a 4 star to rank up. The options are in the picture and everyone with the blue rank up sign. Suggest anyone else to rank up as well. Thanks for the help.