The Rush Pepbox, now made by Lucy Rush in the U.K., is my favorite. It is the best fuzz I have found that works really well with a Rickenbacker 330. It also works well with my other guitars, including humbuckers. But for the Rickenbacker in particular, no other fuzz works as well. This is the original pedal that has been made by Pepe Rush and now Lucy, since the mid 60’s. WEM helped Pepe Rush market them but WEM is out of business. If you see a “WEM” on a Pepbox now it is just a copy of Pepe and Lucy’s original Rush Pepbox. Circuits can be copied for many pedals, but I think components for fuzz, and the care with which they are assembled, can make a difference. There are copies of this pedal and they are “rubbish”, as they say.
https://www.rushamps.com/