All just my personal opinion
Franz Schubert, String Quartet No.15 in G major, D.887 (op.116): a comparison of 3 recordings, with the Melos Quartett Stuttgart (1978), the Emerson String Quartet (1998), and the Artemis Quartet (2009)
Franz Schubert’s Four Impromptus op.90 (D.899), in interpretations by Arthur Rubinstein (1928, 1949, 1950, 1958, 1961) and András Schiff (1990)
Franz Schubert — Lieder, *not* recorded by Fischer-Dieskau: interpretations by Ferrier/Walter (1949), Wunderlich/Giesen (1965), Price/Sawallisch/Schöneberger (1981), Haefliger/Dähler (1987)
Schubert, Works for Violin and Piano — Ibragimova, Tiberghien / Shiokawa, Schiff (and for comparison: Fischer-Dieskau, Moore)
Franz Schubert: Vocal Duets, Trios and Quartets — Ameling/Baker/Schreier/Laubenthal/Fischer-Dieskau/Gerald Moore; Hector Berlioz: Requiem (Grande messe des morts), op.5 — Ozawa/Boston Symphony Orchestra/Tanglewood Festival Chorus
Domenico Scarlatti: Keyboard Sonatas — recordings with Pieter-Jan Belder and Andreas Staier; Schubert: Masses in A♭ (D.678) and E♭ (D.950) — Nikolaus Harnoncourt, Chamber Orchestra of Europe, Arnold Schoenberg Choir