I like Solomon (or (The Solemn One, as I call him ) in op.109 and op.111. Have I heard ALL the recordings of these pieces, though? Of course not. I think the problem is very few, if any, of us have heard all or nearly all the recordings of a particular piece, and even then it's subjective. I often pay attention to International Piano, because they get all the recordings they can get their hands on, then compare them blind. I seem to remember that Serkin came top in the op.111 comparison (one of his later recordings, I think). The Solemn One's recording was also highly recommended.
Appassionata - I like Arrau's live 1959 Ascona recording. Gilels's super-fast live recordings of this piece are almost comical in their intensity.