Well....
The '67 Marshall is my absolute favorite and has been my main amp for almost 10 years. It really can do anything. My band plays pretty loud so I run everything on "10" and the presence on around "5". It came stock with the Super Bass circuit. I removed the trem board and changed it to Super Lead specs. No master, though. I can't say enough good things about it. It is the biggest sounding of all of my amps.
The MC100 is awesome. Rick had originally brought an MC100 and
MC50 out to one of our shows when we were touring Canada in '08 and I fell in love. They have that amazing plexi bark, particularly the rhythm channel with the boost. These amps that I originally played had the "C" transformers and my new one has an "A". There is certainly a difference to my ear and I've been talking to Rick about possibly swapping it out. He's always been super cool to me and has really gone out of his way to make sure that I'm happy. Awesome guy.
I'd say that the Wizard MC100 just sounds like an awesome hyper-plexi with the option of a shit-ton of useable gain. Kind of like the best Marshall you never heard (except for my '67). Tons of headroom. REALLY touch sensitive and barks like mad. It can be really soft and gentle as well as being completely vicious and downright mean sounding. I love it.
The Friedman modded Marshall is similar in it's versatility, but I've found that it just can't keep up with my band and tends to get a little flubby at super high volumes. I don't think that Dave's mod is the issue, but the limitations of this particular Marshall's power section. I still love it to death, though. That's become my play/recording at home amp. It also barks.
The Diezel was on it's way out, but I just recently played it again and it's staying. It's totally great for total other reasons. Compared to all of the others, it doesn't have a very organic quality to it. It sounds like what I imagine an evil robot would sound like, which is totally valid and useful in some situations. It hasn't been updated so it is, to my ears, smoother and has much more midrange than the current models I've checked out. The new ones have a gritty, fizzy layer on the top end that I don't care for as much. I do feel about my VH4 that nothing chunks quite like channel 3. It's amazing how much air and bottom that thing pushes. Channel 2 is my favorite, but channel 3 is something really remarkable for that type of sound.
The Wizard Metal belongs to a friend. We're about to go in the studio and I've been borrowing it for comparisons. It's cool as hell. Sounds pretty similar to the new MC100, but just a little more worn in. I like it a lot.
That may have been more of an answer than you were looking for, but there it is.
Thanks for asking.
-Mike
Sounds great.