I have the Schiit Freya+ preamp, using it with an active speaker pair at the moment, and it is an excellent preamp. In tube mode, (with 6SN7 x 4 ) it gives 12dB gain and gets fairly warm, less so if using the LISST solid-state "tubes" I have not tried it yet with Schiit's amps, mono or stereo. (I'm tempted, I have a pair of ELAC speakers that might benefit.)
I was just looking at Youtube reviews of the Sugden A21SE and the Musical Fidelity A1 (newest version). It was interesting to see the Musical Fidelity had twice as many output filter capacitors in its circuit (all of them 10KuF in both), although the Sugden seemed a little more robust overall. I'm not sure what to make of that.