Personally I prefer to hear Oscar Peterson in a trio setting, or with horns. He swings hard in those contexts. His energy is often so powerful that the music can be highly exciting. He frequently makes me tap my toes and snap my fingers.
His solo playing is where he tends to overplay, and often does not, to my taste, swing, and can be somewhat boring.
Art Tatum was an amazing player with fantastic technique, and harmonic mastery. I can enjoy his playing in small doses, most often at the intellectual level. Often I get the sense that his demonstration of technical and harmonic mastery tends to be showing off his great skills. Though there are exceptions, I don't perceive Tatum's playing swings. his playing does not make me want to tap my toes or snap my fingers.
Though Oscar Peterson is not one of my very favorite jazz piano players, I would (most of the time) rather listen to one of his recordings than to a recording by Tatum.