All just my personal opinion
Beethoven: Sonata for Piano and Violin No.10 in G major, op.96, “The Cockcrow” — comparing 8 recordings: Capuçon/Braley (2009), Faust/Melnikov (2008), Grumiaux/Haskil (1957), Kremer/Argerich (1995), Menuhin/Kempff (1970), Oistrakh/Oborin (1962), Perlman/Ashkenazy (1975), Tur Bonet/Vişovan (2020)
Beethoven: Piano Sonatas — summary for comparisons of recordings, involving the following artists: Wilhelm Backhaus, Paul Badura-Skoda, Daniel Barenboim, Ronald Brautigam, Edwin Fischer, Emil Gilels, Friedrich Gulda, Clara Haskil, Jos van Immerseel, Julius Katchen, Wilhelm Kempff, Igor Levit, Mikhail Pletnev, Maurizio Pollini, Svjatoslav Richter, Arthur Rubinstein, András Schiff, Artur Schnabel, Mélodie Zhao
Comparing recordings with the following artists: Müllejans/Bezuidenhout (2008), Tetzlaff/Vogt (2011), Oistrakh/Badura-Skoda (1972), Grumiaux/Haskil (1956)
Chopin: Piano Concerto F minor, op.21 — comparing recordings with the following artists: Askenase/Ludwig (1963), Avdeeva/Brüggen (2012), Haskil/Markevich (1960), Rubinstein/Barbirolli (1931), Rubinstein/Steinberg (1946), Rubinstein/Wallenstein (1958), Rubinstein/Ormandy (1968)
Mozart: Rondo in A for Piano & Orchestra, K.386 — Clara Haskil, Bernhard Paumgartner, Wiener Symphoniker / Vladimir Ashkenazy, István Kertesz, London Symphony Orchestra / Kristian Bezuidenhout, Petra Müllejans, Freiburger Barockorchester
Beethoven: Violin Sonatas — Summary for comparisons of recordings, involving the artists Busch/Serkin, Capuçon/Braley, Faust/Melnikov, Grumiaux/Haskil, Kremer/Argerich, Menuhin/Kempff, Mullova/Bezuidenhout, Oistrakh/Oborin, Perlman/Argerich, Perlman/Ashkenazy, Szeryng/Rubinstein