All just my personal opinion
Telemann: 12 Fantasias for Flute — comparing recordings with the following artists: Barthold Kuijken (traverso), Dan Laurin (recorders), Leif Ramløv Svendsen (recorder), Maurice Steger (recorders), Dorothee Oberlinger (recorders), Héloïse Gaillard (recorders), Maxence Larrieu (Böhm flute), François Leleux (oboe), Kevin Thompson (euphonium)
Beethoven: String Quartets — summary for comparisons of recordings, involving the following ensembles: Alban Berg Quartet, Amadeus Quartet, Artemis Quartet, Brooklyn Rider, Busch Quartett, Chiaroscuso Quartet, Emerson String Quartet, Endellion String Quartet, Guarneri String Quartet, Hagen Quartett, Kuijken Quartet, LaSalle Quartet, Leipziger Streichquartett, Melos Quartett Stuttgart, Quartetto Italiano, Quatuor Mosaïques, Takács Quartet
Beethoven: Great Fugue op.133 — comparing recordings with the following ensembles: Alban Berg Quartett (1983), Amadeus Quartet (1962), Artemis Quartet (2011), Busch Chamber Players (1941), Emerson String Quartet (1997), Endellion String Quartet (2006), Guarneri String Quartet (1969), Hagen Quartett (2001), LaSalle Quartet (1972), Leipziger Streichquartett (2006), Melos Quartett (1984), Otto Klemperer/Philharmonia Orchestra (1956), Quartetto Italiano (1969), Quatuor Mosaïques (2016), Takács Quartet (2004)
Beethoven, String Quartet op.18/6 — comparing recordings with the following ensembles: Amadeus Quartet (1961), Artemis Quartet (2009), Emerson String Quartet (1996), Endellion String Quartet (1996), Guarneri String Quartet (2007), Melos Quartett (1983), Quartetto Italiano (1975), Quatuor Mosaïques (1994)
Beethoven, String Quartet op.18/5 — comparing recordings with the following ensembles: Amadeus Quartet (1961), Artemis Quartet (2011), Emerson String Quartet (1996), Endellion String Quartet (2007), Guarneri String Quartet (1995), Hagen Quartett (2012), Melos Quartett (1983), Quartetto Italiano (1973), Quatuor Mosaïques (1994)
Beethoven: String Quartet op.18/4 — comparing recordings with the following ensembles: Amadeus Quartet (1961), Artemis Quartet (2008), Emerson String Quartet (1996), Endellion String Quartet (2006), Guarneri String Quartet (1995), Hagen Quartett (1999), Melos Quartett (1983), Quartetto Italiano (1975), Quatuor Mosaïques (2004)