I can't speak for Chuck, of course, but if I remember correctly he once posted that he didn't like Gilels in Beethoven. Anyway, Gilels' unfinished cycle (DG) is one of my favourites, along with the earlier Kempff (mono, DG). Annie Fischer (Hungaroton) is an acquired taste in Beethoven, though I like what she does, and I also like most of Solomon's interpretations (Testament, not EMI); Schnabel (Naxos, not the earlier, heavily no-noised EMI set) is hors concours.