Rank up advice

I have resources to R5 my 4* Se Spidey, but also have a 5* Doc Oc, neither awakened. What do you guys think? Im leaning towards Doc OC simply because I don't have any R3 5*s.
I also have a 4* awakened Ultron, 4* awakened Yondu. And I just opened a 4* medusa.
I also have a 4* awakened Ultron, 4* awakened Yondu. And I just opened a 4* medusa.
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Thanks