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Hot take: Yellow Diamond is the best, and it isn't even a contest. Also, I hate the meme face.
As in, Even if she were human-sized, she'd still wouldn't be anyone you'd wanna piss off. She seems like she'd break at least three bones if you talk shit to her.
Blue and Pink are only intimidating because of their size and White's only intimidating because of her power, and she never fucking blinks.
Yellow, on the other hand, she most likely knows at least one martial art. Like, I'm pretty sure she's the only character in the show who could kick as fast as Chun-Li.