Dr. Voodoo or Mephisto?

I've had my 4* Dr.Voodoo for a while and got him to r3 30 and recently got 4* Mehispto from champions crystal they are both undupped should I focus on r4 Dr.Voodoo or bring up Mephisto I already have enough to bring him to r3.
Who should I focus on ??
Who should I focus on ??
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