What is your preference and why? I prefer both for different uses: Master Volume amps: I love being able to dial in the master to achieve power tube saturation at manageable volumes. I generally use this method when I am using amp OD by itself and use volume knob control for clean. (disclaimer: I use a one channel amp for this) I think a lot of players who big themselves up to be "holier than thou" hate master volume amps because they associate it with buzzy preamp overdrive. However, if used right, I think they are a more useful tool for gigging players who wish to achieve power tube overdrive in various rooms and gigs where volume is an issue: Non Master volume amps: I prefer a non master volume amp ala my Mesa Blue angel or Fender Bandmaster when I feel like using a good OD or fuzz pedal. This creates a more simplistic setup. You turn amp on, get clean rhythm level, and dial your pedal in, no balance between master and such. So, in short, I think they both have their uses. What I do not understand is the reasoning behind players who just "hate master volume amps"...Perhaps I am missing something. Discuss.