All just my personal opinion
Beethoven: Piano Sonata No.22 in F major, op.54 — comparing recordings with the following artists: Wilhelm Backhaus (1969), Paul Badura-Skoda (1969), Daniel Barenboim (1984), Ronald Brautigam (2007), Friedrich Gulda (1967), Maurizio Pollini (2003), Artur Schnabel (1935)
Beethoven: Piano Sonata No.15 in D major, op.28, “Pastoral” — comparing recordings with the following artists: Wilhelm Backhaus (1961), Paul Badura-Skoda (1969), Daniel Barenboim (1984), Ronald Brautigam (2005), Emil Gilels (1982), Friedrich Gulda (1967), Artur Schnabel (1935)
Rubinstein’s Solo Recording Repertoire: Mozart: Rondo in A minor, K.511 (in comparison with Walter Gieseking, Ronald Brautigam, and Kristian Bezuidenhout);
Rachmaninoff: Prélude in C♯ minor from “Morceaux de fantaisie” op.3;
Szymanowski: 5 Mazurkas from op.50
Beethoven: 6 Variations on an Original Theme, WoO 77 — Ronald Brautigam (2010, fortepiano), Olli Mustonen (1995); Beethoven: Allegretto in B minor, WoO 61 — Ronald Brautigam (2010, fortepiano); Beethoven: 6 Ecossaises, WoO 83 — Alfred Brendel (1985)
Beethoven: Variations on the Minuet “à la Viganò”, WoO 68 — Mikhail Pletnev (1997), Olli Mustonen (1995), Ronald Brautigam (2011); Mendelssohn-Bartholdy: Organ Sonatas op.65 — Heinrich Gurtner (1989), Stefan Schättin (1995)
Beethoven, Piano Sonata No.8 in C minor, op.13, “Pathétique” — Backhaus (1958), Barenboim (1984), Badura-Skoda (1969), Schnabel (1935), Fischer (1952), Gulda (1967), Immerseel (1983), fortepiano), Gilels (1980), Brautigam (2003, fortepiano); Piano Sonata No.14 in C♯ minor, op.27/2 — Badura-Skoda (1969), Barenboim (1984), Backhaus (1958), Gulda (1967), Schnabel (1935), Pletnev (1988), Gilels (1980), Immerseel (1983), fortepiano), Brautigam (2003, fortepiano)