well, what do you think of the two Vladimirs?
I don't think that there should be a comparison. Horowitz is and always will be one of the greatest pianists - he brought spontaneity and new life to every piece he played. Ashkenazy, on the other hand, often times plays very generically. I still think Ahkenazy is a great pianist who has an amazingly large repertoire, but he doesn't really compare to Horowitz.