What champ should I rank up next?

Wordy12

I have some decent champ at rank 4 as a 4 star, also a SL at rank 2 In 5 star, but my next 5 star will be when I could get stark spidey or yondu. Tell me what you think I should do!

SharkPowerr99

I would do Thor or SL because when you dupe SL he is a beast