The Comet and the Discovery amps put out the same wattage. The voicing is different. If I'm in the mood for Stravinsky or Bartok or Mahler, I prefer the Discovery amps. Same if I want to hear Tom Waits or Elliot Smith and similar artists. For a Bruckner symphony, with big brass sections, the Comet does a better job with it's energetic midrange. Same with jazz and classic rock.
Huff preferred the Comet in his video because he was using the Navy. My Emotive Epifania preamp is very resolving and is perfect for the Comet, but the P75 has more tonal density and a better with the Discovery amps.

