Which ever amps have the BEST specs.
Not in the case of this EE. IMO the proper (and necessary) role of specs is to allow one to identify and RULE OUT from consideration candidates that would be poor matches to either the surrounding components (for example, due to impedance incompatibilities, gain and sensitivity mismatches, etc.) or to the user's requirements (for example, how much power is needed to support desired peak volumes).
I chose my VAC Renaissance 70/70 MkIII amplifier because of VAC's reputation for outstanding sonics and exceptional build quality; their exemplary approach to dealing with and supporting their customers; because my previous amplifier experiences had me convinced that the kind of sonic richness and dimensionality I was looking for tends to be a forte of well designed tube amplification; and because of what I perceived to be a recognition among many listeners whose opinions I particularly respect that well implemented zero feedback designs utilizing directly heated triodes such as the 300B tend to have a certain magic about them.
Also, the cost of this particular amplifier, purchased used, was comfortably within the bounds of what I wanted to spend. Its physical configuration and appearance were significant factors as well, especially given that my system is in my living room.
Regards,
-- Al