All time: probably Myra Hess.
Today: probably Stephen Hough.
I think that negative comments against Malcolm Binns were a little harsh. he's an excellent journeyman pianist, and should be given credit where credit's due. Not perhaps the greatest, but exciting enough to be praised. (And, ridiculous trivia here: Malcolm Binns was in Gary Cooper's last Hollywood film, as a pianist on the background TV, playing the Rachmaninov 3rd).