All just my personal opinion
Beethoven: Cello Sonatas — Summary for comparisons of recordings, involving the following artists: Casals/Horszowski, Casals/Schulhof, Fournier/Schnabel, Fournier/Gulda, Fournier/Kempff, Harrell/Ashkenazy, Isserlis/Levin, Maisky/Argerich, Perényi/Schiff, Queyras/Melnikov, Rostropovich/Richter, Wispelwey/Komen, Wispelwey/Lazić
Comparing recordings with the following artists: Casals/Horszowski (1939), Fournier/Schnabel (1948), Fournier/Gulda (1959), Fournier/Kempff (1965), Harrell/Ashkenazy (1987), Isserlis/Levin (2012), Maisky/Argerich (1991), Perényi/Schiff (2004),
Queyras/Melnikov (2013), Rostropovich/Richter (1962), Wispelwey/Komen (1991), Wispelwey/Lazić (2004)
Zurich, Tonhalle, 2016-06-21: Fazıl Say, Gábor Boldoczki, Willi Zimmermann / Zurich Chamber Orchestra (ZKO) — Handel: Suite in D, HWV 341; Dmitri Shostakovich: Piano Concerto No.1 C minor, op.35; Ludwig van Beethoven: String Quartet No.11 in F minor, op.95 (arr. Gustav Mahler)
Comparing recordings with the following artists: Casals/Horszowski (1939), Fournier/Schnabel (1948), Fournier/Gulda (1959), Fournier/Kempff (1965), Harrell/Ashkenazy (1987), Isserlis/Levin (2012), Maisky/Argerich (1991), Perényi/Schiff (2004),
Queyras/Melnikov (2013), Rostropovich/Richter (1962), Wispelwey/Komen (1991), Wispelwey/Lazić (2004)
Comparing recordings with the following artists: Casals/Schulhof (1930), Fournier/Schnabel (1947), Fournier/Gulda (1959), Fournier/Kempff (1965), Harrell/Ashkenazy (1987), Isserlis/Levin (2012), Maisky/Argerich (1993), Perényi/Schiff (2004),
Queyras/Melnikov (2013), Rostropovich/Richter (1961), Wispelwey/Komen (1991), Wispelwey/Lazić (2004)
Beethoven: Piano Sonata No.26 in E♭ major, op.81a, “Les Adieux” — comparing recordings with the following artists: Wilhelm Backhaus (1961), Paul Badura-Skoda (1969), Daniel Barenboim (1984), Ronald Brautigam (2007), Emil Gilels (1984), Friedrich Gulda (1967), Arthur Rubinstein (1940 and 1962), Artur Schnabel (1935)