I have had an in-depth listening experience with a couple of different amps from 1 Raidho model only that my friend owns. Hence, I can't be for sure that all models are similar.
It may be correct or incorrect to say that all Raidho models have an overall laid-back sound signature, relatively speaking/in comparison to Borresen. Borresen feels more immediate, in your face. Resolution, detail, clarity, etc are similar.
Both have some perceptive traits similar to 3d/ spatial/object based audio in spite of listening in 2 channel stereo (more so in Borresen).
Overall, Borresen pricing reflects a more charitable Michael B trickling things down, wanting higher fidelity levels and an enhanced experience to be reachable for guys with smaller wallets.