I'm another R2R tape fan. 15 IPS 2 1/4 inch track tape replay is about as good as one can get, unless you get lucky finding 1/2 inch masters.
Personally I use the RMGi (now Recording the Masters) brand, which is the continuation of the classic BASF and AGFA formulations. My normal tapes are either SM911 (1.5 mil base) or LPR35 (same formulation as SM911 but on a long play 1 mil base). I use 2 x Sony APR 5003 and a Studer A807/II. I have too many R2Rs and am reluctantly letting my Revox G36 High Speed go.
Personally I use the RMGi (now Recording the Masters) brand, which is the continuation of the classic BASF and AGFA formulations. My normal tapes are either SM911 (1.5 mil base) or LPR35 (same formulation as SM911 but on a long play 1 mil base). I use 2 x Sony APR 5003 and a Studer A807/II. I have too many R2Rs and am reluctantly letting my Revox G36 High Speed go.