Who to rank to r2

Please help, they seem of similar value to me unawakened... I have completed 6.3 and most variants. I need an r2 mutant though...

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Why do you need a rank 2 mutant?

Why do you need a rank 2 mutant?

to help me with Cavalier EQ exploration in the chapter of mutants (both these champions benefit from bleeding). I dont want to invest in 5*