Don't know those unit you mentioned, but as a rule I'd stay away from everything that mention "tube" in low cost hardware. Those are not real tube amp design, but what some refer to as "starved plate" which just means the tube operate at low voltage; all it does is add indiscriminate noise to the signal and make the unit hot, as useless as useless can be. If I was purchasing a pre in the sub 200 buck range now, I'd get a DMP3.