The Wadia is overall better than the Gamut and more than twice the price. The Wadia has a very convincing sound without any digital edge whatsoever. It is the best all-in one player that I have heard. Close to analog, but lacks that last bit of life, energy and air, that only a good moving coil can produce.
The Gamut which I have in my system has the same lack of digital edge like the Wadia with a balanced sound; treble energy matches bass energy. Soundstaging is also excellent (better than most cdps), but not like the Wadia.
I have not heard the Sonic Frontiers so I cannot comment on that player.