I've been seeing alot of Muff alot on her pedalboard lately (Russian, Triangle, and NYC).
Myself, I use a Muff. Honestly I don't like a Muff into a clean amp....it's not that interesting sounding IMO. But if you run it into a clean amp that's being pushed for huge overdrive it sounds awesome. Mine's run into an Orange that's permanantly on 10.
The muff is a great starting point for fuzz, plus theyre cheap so you can mod the hell out of them without worrying too much (and theres a lot of mods out there)
My home built uses lower gain transistors than stock and run into a little overdriven fender (pretty good through marshalls too) it's the business.
Also certain guitars seem to suit certain guitars, as my the muff I use sounded best with a Tokai firebird and a friends Epi casino. It's also brilliant with my strat (and it does obcene things with the 12 string (obcene in a good way)). But just didn't seem to get along with the Peavey I have (a set of mules should fix that).
Whereas the Danelectro French toast, suits the Wolfgang much better (to my ears.) Perhaps Muffs suit single coil pickups better.
So try them all with a guitar similar to the one you normally use.
Rob...