The MXR Sub Machine Octave Fuzz is unique in that it is two effects in one that you can mix either in parallel or in series with the push of a button, as well as having both a higher and lower octave. By engaging parallel mode, you get a clean octave sound and a fuzzed fundamental – hit the series mode and both signals get fuzzed out. Two totally different vibes from one pedal.
The Fuzz Face Mini, on the other hand, is cool because of it’s diminutive size – it’s a miniaturized Fuzz Face with the same circuit of the full-sized version. It has fewer features than the Sub Machine, but takes up much less pedalboard real estate.
So if you want that classic rock fuzzy psychedelic sound, these might be two pedals you should consider adding to your arsenal.