Who would be the most beneficial rank up for cav?

I'm struggling on cavalier mainly because of techs. Like sentinel/Ultron. Who would be the best to rank up?

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If you are talking about getting cavalier and completing 6.1, exclude 4*s from screenshots.
You didn't send your top champs, so someone couldnt provide helpful tip.

In these 2 screenshots, nebula is your answer.

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