Rank up 4* or 5*?

So my predicament is that I don't have a lot of 5*, but I did manage to pull an Emma Frost (which I can take to r3) but I also just duped, for the first time, my 4* SL and can take him up (potentially to r5). Hoping to get some of the expertise in these forum discussions to help me decide. Thanks in advance everyone!

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