Who should become my first 5*/R5?

RoOOts

Which of the following 5* Champs should become my first R5? I am uncollected but still have to do first runs and completion of 5.3, 5.4 and LoL. And have not completed all of 5.2. All of the Champs but Domino are at R4, and i would have to wait a bit longer for Domino for 4xT2A.

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Domino