Simaudio Moon 600i or Bryston B135SST with Focal 836W Prestige Speakers.

Recently I purchased Focal 836W Speakers so now I am looking
for the Integrated Amplifier that would bring the best of the Focals.
I am not familiar with the Bryston sound. From the Simaudio side
I had the chance to listen only NEO 250i. I was impressed with the bass
but not with the highs (rolled off). Of course, the 600i is on the another level
but would it be a huge improvement over NEO 250i.
Opinions would be greatly appreciated.
Thanks