All just my personal opinion
Richard Strauss, Violin Sonata in E♭ major, op.18 in three interpretations: Haifetz / Sándor (1934); Spivakov / Bezrodnyi (2001); Frang/Lifits (2010) — and memories only (sadly) of an LP recording with Ulf Hoelscher and Michel Béroff (1978)
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)
Rubinstein’s Recorded “French” Solo Repertoire: César Franck — Prélude, choral et fugue
Rubinstein’s Recorded French Solo Repertoire: Maurice Ravel — Miroirs: No.5, “La vallée des cloches”; Valses nobles et sentimentales; Le Tombeau de Couperin: Forlane — all with comparisons to Walter Gieseking
Chopin: Piano Concerto in E minor, op.11 — comparing recordings with the following artists: Argerich/Abbado (1967), Askenase/Otterloo (1960), Avdeeva/Wit (2010), Avdeeva/Brüggen (2012), Rubinstein/Barbirolli (1937), Rubinstein/Wallenstein (1953), Rubinstein/Skrowaczewski (1961)
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