Skill rank up. 5* or 4*
I have 4* rank 4 crossbones and gwenpool (nobody dupped, but I have a gem, and many sig stones). And 5* BP classik rank 2 (sig 36, could be 50 if needed). What is the best option for me?
P.S. DW are maxed. And I have only 1 4* 5/50 (hyp) and no rank 3 5*.