Tough Call! I ultimately narrowed my own search to these same amps. The Pass finaly won out, but mostly due to non-sound related issues. Pass (Built in States and very accessible), Balanced design working extremely well with balanced Line stage (Also a Pass), and not a full time Class A design therefore saving some power and heat (I leave my components on full time.)
As for sound, they're both outstanding, but I believe the pass edged out here as well, particularly in HF extension and transparency.
Good luck.
Good luck