I did an extensive comparison of the Gryphon Diablo and the Gamut DI150.
The Gryphon is an excellent amp, but there was no question in my mind that the Gamut was clearly superior, and I bought it.
The Gryphon seemed to have slightly more bass weight and was slightly richer, but also a little more congested, cloudy, or confused, especially when many instruments came together. The Gryphon also had slight hardness to some higher frequency female voices and some of the bass notes.
The Gamut was immediately much more open and spacious with lots of air between the instruments, and a much more 3D soundstage. Great depth and width! The voices and instruments themselves sounded cleaner and more accoustic to me, as if someone cleaned the window you are looking through, but also a slightly leaner sound throughout. To me the Gamut had less bass, but the bass was more musical and cleaner.
Since owning and running it in fully, I have found the slightly lean sound is gone, with the right choice of cables.