Killmonger or Elsa Bloodstone

As the title says... should I rank 5* my 5-Star awakened Elsa or Rank 2 my 6* awakened Killmonger.
Currently I've done Variant 2, 3 and 4 100%, so mainly I'm interested on act 6 completion and eventual exploration, also general questing (Cavalier difficulty is comming, the hype is real!)
Thanks in advance for your advice guys!