The Bazz Fuzz Face is basically a silicon Fuzz Face and a Bazz Fuss in the same box. A switch in the middle allows either effect to be selected. Both circuits have been modified a little from their original schematics. The volume, tone and dirt controls are shared by both circuits. The choke knob only affects the Fuzz Face.
The Bazz Fuss has a much more aggressive, modern heavy sound to it, while the Fuzz Face in comparison is more of a noisy, chaotic fuzz that's both very versatile and responsive to playing style.
The Bazz Fuss is a great beginner fuzz circuit because it contains so few parts and still sounds great. The original design can be found on home-wrecker.com(opens in a new window). After testing a few of the versions I went with version 3, using an MPSA13 transistor and a 1N914 diode. Here's a video I found(opens in a new window) on how to make these.
The Fuzz Face is a classic fuzz pedal whose design is very suitable for making modifications. The NPN silicon design on this page(opens in a new window) was my starting point. I made a few changes.