Rank up Warlock or Ultron?

I have enough Catalysts to EITHER upgrade my best Champion 5* Warlock to Rank 5 OR my second best Champion 5* Ultron to Rank 4.

Which is the better option?

Rank 5 Warlock and Rank 3 Ultron

OR

Rank 4 Warlock and Rank 4 Ultron?

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