Supernait 2 v Nait XS2

I have one of each and recently substituted them as the amp in my spare system.
The XS2 seems to be more sensitive to input voltage giving a stronger gain v the Supernait 2.
Musically the XS2 is rather less sophisticated in the sound and this is more noticeable as you turn the volume up. The 70 watts per channel v 80 watts is little different but in reality the Supernait adds more grip and composure to the music. I have also used either as the power amp for a new NSC222 till the new NAP 250 arrives this month.

That composure bit is the reason I actually prefer the XS2, imperfect as it is, to the SN2.