Just a couple things right off the bat. 1) The MB fan is much quieter than the fan on the mini max. 2) On the MB you can drive the preamp hard and can get very dirty, where the mini max just goes to the very beginning of breakup. Think a gritty fuzz vs an OD with just a tiny bit of drive engaged. 3) With everything set at noon the MB is a little more present in the high mids and highs and a bit brighter across the board 4) Mini max has both passive and active inputs where the MB has just the one input. 5) The MB has a 4 band EQ. The peavy has a 3. 6) The Peavy has an on board tuner the MB doesn't. The peavy is rated 350 W @ 8 Ohm, 600 W @ 4 Ohm. The MB is rated 600 W @ 8 Ohm, 1000 W @ 4 Ohm. My initial impression is that the sound floors are similar, the MB might be a hair quieter? Not sure though would have to do a side by side comparison. As far a loudness goes, I would say watt for watt it's dead even between the two Overall I'm happy with both amps. I run a mesa subway preamp+ paired with a boss gx-10 for my compressor and whatever other effects I need in my signal. So both preamps are getting bypassed and I'm just using the power section of the amps at the moment. That mesa subway pre+ just sounds so darn good it trumps them both IMHO. Now don't get me wrong, both the MB and Peavy are great in their different ways, but the Mesa is something special. But as they say horses for courses as YMMV.