Who should I take to r4 for Superior Kang?

Going to make the jump to Paragon soon, I plan on using 5* Ultron but I want to have another option just in case, who should I r4 for that fight? I ve heard both of them work pretty well:
Who should I take to r4 for Superior Kang? 34 votes
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I do think you need high sig though, I wouldn't use him at low sig at least, I'm only using my 5* cause he's max sig.