Most SET amp owners will tell you they sound more pure and closer to the music, and SET amps certainly have less parts/engineering.
SET amps aside, however, I don't believe you can assume that low power in a push-pull design translates to more natural or purer sound than a high powered amp of the same design. It really has everything to do with the amplifier/speaker match...not only power/sensitivity, but also impedance match.
Few amplifiers sound more pure and natural than a high power, VAC push-pull amplifier mated with the proper speakers.
SET amps aside, however, I don't believe you can assume that low power in a push-pull design translates to more natural or purer sound than a high powered amp of the same design. It really has everything to do with the amplifier/speaker match...not only power/sensitivity, but also impedance match.
Few amplifiers sound more pure and natural than a high power, VAC push-pull amplifier mated with the proper speakers.