It is not an apple to apple comparison. Different products for sure. The Waxwing offers more flexibility - both in capabilities and control via the phone app. Things like azimuth, real time ADC inputs levels, turntable speed measurement, fine tuning of balance and response, 24 memories, log time on each memory - the list goes on....
USA built versus China - if that is important to you. Unparalleled support - can you notify the folks at minidsp of a bug and get a fix a week or two later that downloads via the phone app to the product? That happens with the Waxwing. Not the same at all. Looking at the Adept - it has some nice points, but it appears to be something designed to check the measurement boxes - if the specs are to be believed. The Waxwing covers the functionality and practical needs of the medium.