All just my personal opinion
Bach, St.John Passion BWV 245, with the following artists: Harnoncourt / Equiluz (1965), Jochum / Haefliger (1967), Rotzsch / Schreier (1976), Koopman / de Mey (1993), Suzuki / Türk (1998), Gardiner / Padmore (2003), Layton / Bostridge (2012)
Lieder recordings (Beethoven & Schumann) with Fischer-Dieskau/Moore, Wunderlich/Giesen, Goerne/Schneider, Terfel/Martineau, Bostridge/Drake; Schumann: Piano Quintet op.44, Piano Quartet op.47 — Melnikov/Jerusalem Quartet, Levine/LaSalle Quartet; Webern: 6 Bagatellen, 5 Movements for string quartet, op.5 — Hagen Quartett
Bach: Cantata BWV 140, “Wachet auf, ruft uns die Stimme” — Comparing 5 recordings: Leppard/English Chamber Orchestra, London Voices (1981), Harnoncourt/Concentus musicus (1984, partial), Gardiner/Monteverdi Choir/English Baroque Soloists (1992), Koopman/Amsterdam Baroque Orchestra & Choir (2006), Lutz/J.S.Bach-Stiftung St.Gallen (2008, DVD)