Belles 150A ref V2 vs Bryston 4BSST2

I have a Belles 350A (not Reference model). I think it depends on what you're pairing it with. My preamp is a Joule Electra LA 150 Mk2, and absolutely no fatigue when listening for hours. The Belles in this system is in no way bright, analytical, or harsh, yet detail comes through (of course not to the level of much more expensive amps). I was a professional bass player for years and know bass, due to the Belles damping factor of 1000 it controls woofers extremely well, good deep but not wooly bass (have Salk Soundscape 8 speakers). I can't speak to the Bryston, having never heard one. Hope this helps.

I have owned many solid state amps, Conrad Johnson, Audio
Research, McCormack, Bat, Bryston, etc and some were very good
but the Belles really pulled away from the crowd & stood out
in a positive way. I have not heard that big tall, room
filling sound from no other solid state amp. For myself it was
a revelation. I'm sure that the associated gear can also make
or break ones final decision.

4BSST2 arrived the other day paired w/BP17 preamp & PSB Synchrony one speakers.
Sounds really good & full w/taut bass + Clarity