@swede58 Unfortunately, I did not compare the Gryphon Diablo 120 and Pass Labs INT-250 at the same time or same venue. So any conclusions one might draw from such a comparison are bound to be meaningless. Having said that, going by aural memory I liked the INT-250 a bit more. The Diablo had a more muscular, slightly darker sound. But it also had better transparency and resolution. The INT-250 had more of the tube-like bloom which I enjoyed. It also sounded bigger, but at the expense of ultimate transparency and detail. The 250 was also a bit warmer, which is my preference. From what I understand, a better comparison would have been either Diablo 120 vs PL INT-60 or Diablo 300 vs PL INT-250. But I never got a chance to listen to the Diablo 300 in my home. So take it with a grain of salt,
At the of the day, it really boils down to what kind of sound signature you prefer. For me, the Aavik U-280 kinda split the difference between the INT-250 and Diablo 120. It gives me a good dose of the Pass Labs warmth, bloom (though not to quite that extent) and the Diablo’s transparency and muscularity.