All just my personal opinion
Mozart: Piano Concerto No.17 in G major, K.453 — comparing recordings with the following artists: Géza Anda (1962), Vladimir Ashkenazy (1977), Daniel Barenboim (1968), Kristian Bezuidenhout/Petra Müllejans (2012), Arthur Rubinstein/Alfred Wallenstein (1962), Andreas Staier (1995)
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
Schubert, Works for Violin and Piano — Ibragimova, Tiberghien / Shiokawa, Schiff (and for comparison: Fischer-Dieskau, Moore)
Horn and Fortepiano (Beethoven, Krufft, Leidesdorf) — Anneke Scott (natural horn) & Kathryn Cok (fortepiano); Scriabin: Piano Sonata No.3 in F♯ minor, op.23 — Vladimir Ashkenazy, Bernd Glemser, Marc-André Hamelin
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, “Eroica”-Variations op.35, Comparing recordings with the following artists: Artur Schnabel (1938), Glenn Gould (1970), Svjatoslav Richter (1970), Emil Gilels (1980), Konstantin Scherbakov (1984), Alfred Brendel (1985), Olli Mustonen (1993), Ronald Brautigam (2010)