Im looking for some type of overdrive pedal/fuzz, and was wondering what the difference between the Muffs from EHX is- little big muff, big muff pi, etc. etc.

If not something from EHX, then what pedal should I look at? Im into everything from blues and RHCP type rock to prog rock/hardcore.
Not sure of the difference between little and big muffs but I know that the Russian made muff sounds a little more modern/less fuzzy than the American. I had both plugged in at guitar center and the Russian seemed to be more gain oriented while the American went more for the Fuzzy Hendrix sound.
the lesser known of the 4