The Custom has a more solid low end chunk and a bit more sharpness in the highs than the JB, and it is a little bit more balanced in the mids (but not scooped). It is described as a PAF on steroids, I don't know if I agree with that but personally I find it quite a well balanced pickup for high gain tones in the right guitar. It should be less hot an in your face than the Distortion. If you wanted to stay Duncan I think it is a good choice.