Schubert's piano sonatas are wonderful, but they are not superior to Beethoven's sonatas. No way. Beethoven's greatest compositions may very well have been his sonatas, and the late works achieve a spiritual solemnity that no one has ever matched, in my opinion. The Arietta of his last piano sonata and the slow movement of the Hammerklavier are miraculous! I agree that Schubert's sonatas were unjustly ignored for far too long, but that doesn't mean they are greater than Beethoven's. Ludwig, without question in my opinion, was the greatest composer of piano sonatas of all time. It isn't even close.