My favorites of all time include Earl Hines, Errol Gardner, Oscar Peterson and Bill Evans. Art Tatum was probably the Franz Lizst of all jazz pianists, too bad there aren't more and better recordings of him as he is just dazzling and probably the most gifted with his virtuosic speed and on the fly harmonic variations on the melody. Thelonious Monk for a most original style and tempo, no one like him for sure. And Bud Powell, of course.