Hi Jayme,
I wouldn't get hung up on the technical details if I were you. Yes...MOSFETS can sound great in a great design, but a poorly designed MOSFET amp can sound awful. The same is true for balanced circuitry and all other aspect of audio design. Most equipment was designed by different people with varying ideas of what music should sound like. Unfortunately, the only way to know what is "the only way to go" is to listen to different amp designs and decide for yourself.
I wouldn't get hung up on the technical details if I were you. Yes...MOSFETS can sound great in a great design, but a poorly designed MOSFET amp can sound awful. The same is true for balanced circuitry and all other aspect of audio design. Most equipment was designed by different people with varying ideas of what music should sound like. Unfortunately, the only way to know what is "the only way to go" is to listen to different amp designs and decide for yourself.