The best preamp is no preamp only until you hear high quality active preamp
While I don't disagree that active preamps can be very good, I think if a high quality passive doesn't beat it, your system is what's at fault. I have owned many "higher end" active preamps from CJ, ARC, deHavilland, Art Audio, Lamm, Audible Illusions, Cary, BAT, and the list goes on. But a TVC or LDR beat every one of them.