Horowitz not even touched Schubert and scarcely Beethoven perhaps.
Poor repertoire.
Richter, the box, the poet, the mystic, the virtues,... he could do everything in a staggering personal way. As I said on his Schubert recordings.
Better question. Richter or Gilels, another tower genius. But still Richter on top...
Sad he did not deliver a Rach 3, or Prok 2 or 3.... But he had his reasons for sure.
Nobody surpassed him.
Poll
RICHTER VS HOROWITZ