Hard to tell .... they were superb with Mozart, Beethoven, Schubert, Brahms, Bartok and Janacek but also with 20th century composers like Rihm, Einem, Lutoslawski and Berio .... unfortunately their spiritual leader Thomas Kakuska died in 2005 - the three remaining members tried to go on with a pupil of Kakuska, but the magic was gone and they finally disbanded in 2008 ..... unfortunately the Alban Berg Quartett never was recorded adequately .... I can asssure you that on stage they were in another league - attending these concerts was similar attending a high mass .... those were the days ....