NuPrime vs NuForce

how do they compare ?I mean: is it possible to establish some sort of "hierarchy" in their power amps in particular ?are NuP ST10M comparable to NuF Ref9V3 or to Ref18 ? or are they in the middle ?I know this is usually nonsense, but in this particular case, as NuPrime people and designers are more or less same of NuForce and I imagine NuP designs are based on, or start from NuP designs, so I wonder if it is possible to compare them strictly.anyway: has anyone had the chance to compare them side by side, or has anyone of you owned models of both brands ?