Rank 4 6* help

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Who should I rank 4 6* next?
I got a good balance already with Kate bishop, Mr sinister, cgr, hulk
I'm thinking maybe hulking due to his kit?
Doom I already got maxed out ascended and duped 5*
Kitty need more practise so will wait

Who should I rank 4 6* next?
I got a good balance already with Kate bishop, Mr sinister, cgr, hulk
I'm thinking maybe hulking due to his kit?
Doom I already got maxed out ascended and duped 5*
Kitty need more practise so will wait
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Comments
doesn’t need the dupe and has great damage
Can be used everywhere and is also good defender