Big NKS Fan !
Great question and watching for valid, relevant replies !What improvements would I see over my Focusrite Saffire Pro 14 with either the RME Babyface Pro or the Universal Audio Apollo Twin Quad MkII ?
I have used (2) Saffire Pro 14 for many years and they remain rock solid.
My interest is updating one, or more, of (3) desktop, Win10 Pro, Reaper DAW, PCs. It makes sense to replace these older Audio I/Fs but solid technical gains are only reasons to move me away from Focusrite.
Like OP, I do not need several I/O, and really not top-end PreAmps.
For new investment, Clarett probably still makes sense, so 2PreUSB or 4PreUSB are my choices.
Can RME truly excel over Clarett and how?