4* or 5*? Help

I have a duped 4* magik and a 5* unduped guillotine. I have enough to to take either of them up 1 tier but which one should I do? I use them both regularly and have no other power drain champ but I do have a different damage champ (Gwenpool), I was wondering with the onset of 6* which champ should I take up a tier?
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