The traditional wahs have a switch you have to stomp on (it's under the front lip of the pedal). Same kind of analolg switch most pedals have. click on, click off. The Moeley's have an optical switch, which won't wear out. Soon as you step off of it, it goes into bypass, and shuts off. When you have a mechanical switch, it can get noisy over time. The downside of the switchless ones is that you can't partially depress it, and leave it there, ala Michael Schenker. The Moreley is sprink loaded. You get off of it, and the effect shuts off (bypass).
The BH's have a pretty wide "wah" contour. it just takes getting used to. When I tried one out, I tried getting that vintagey Voodoo Chile sound, and it sounded like a cat running headlong into a blender
The pedal movements had to be more precise, if that makes any sense.....
edit: IIRC, the whole "pot" is optical, that's another part that can wear out & get noisy on the CB models. Some prefer the vintage style. Different strokes for different folks