To be honest all three have worked very well. Musical, dynamic and well balanced. I guess that I would prefer the SimAudio because it is so versatile. My unit has the DAC, PHONO and Digital input options installed. The first 5 watts are class A and it has discrete circuity, excellent parts quality, a great remote and a powerful toroidal power supply. The Naim 5i-2 was my second favorite followed by the Unison Research Unico hybrid integrated.
BTY,
Tom
BTY,
Tom