With me it's all about the speakers and the room. I have a Torii Mk III, a Torr Mk II, an Integrated SE34, and a set of SE34 monoblocks. The smaller single-ended amps definitely have a faster sound, a different way of dealing with transients. As you say, both are wonderful and in my case I'd be very happy with the smaller amps. . . if I didn't have a largish room for my main system and ERRs that like more power than they can deliver, I'd probably still be using the Select I had years ago.

Wonderful amp in every way except. . .power handling.
The plus side is that the Torii lets me hear orchestral work and hard slamming stuff that are congested and not served well with the smaller amps. And the ERRs just come alive in a way with the Torii that they can't with the smaller amps. I'm very happy with what I have now, very happy, but I can definitely see being equally happy with a diferent set of Decware amp and speakers in a different room!
In my second system I can use the smaller amps (I seem to have settled on the SE34 Monoblocks) and get great sound: small room, low volume levels, I'm using the HR-1s that seem to offer a more focused sound with smaller volumes than the ERRs.
The good thing is having so many options as we do, a large and a small Decware amp.