Should I rank 2 6* CAIW or rank 5 5* CORVUS or rank 5 5* VOID ?

I already have 5* Blade GR Sparky in 5/65
So should I rank 2 6* CAIW or rank 5 Corvus or Void ???

Comments

6* CAIW

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AQ map 6 and map 7 ,AW tier 1-5 , event content. Corvus is so versatile and helpful.

Downside is there's a deadpool immune to corvus..