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More Vicious: (See cave fight)
Palpatine slaughters a group of Gran Protectorate Senators, their guards, and women & children in Darth Plagueis.
Scarecrow
More Faster: (See cave fight)
Palpatine’s physical speed is comparable to Yoda’s own, beyond what can be perceived by Anakin, in excess of what Mace Windu can reproduce without Vaapad, and sufficient to slaughter two “celebrated swordsmen” of the Jedi Council before they can react.
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More Powerful: Given that this limits Palpatine to RotS feats, he's basically got Sithisis and RotS to draw from. Mara has her 3x force power bubble, cross-galaxy awareness (routine as a hand as well as her link w/Ben) and the whole manhandling a Skywalker descendant charism.
Palpatine’s galactic clairvoyance is displayed in Revenge of the Sith where he senses Anakin’s danger on Mustafar from Coruscant.
You need to substantiate why manhandling a Skywalker is a decisive advantage for Mara; Dooku did it to the Skywalker and Palpatine’s powers eclipse his.