Re: Anybody know Charvels?
Most people will tell you that Charvel & JB's go together hand in glove: if Charvel / Jackson has a sound, its the JB.
I'm gonna say the Duncan Distortion because: it's heavier. The lead tone isn't as honey sweet because JB's have that midrange focus. However, it's common for some guitars to have soggy spongy bass chunk with a JB.
So unless you ONLY play a stack, on 10, the Duncan Distortion (with its mighty double ceramic magnet) is pretty much a heavier identical big bad brother to the JB (with its middle of the road Alnico5 magnet): the DD is easier to get a tight metal bass chunk on any amp, any wattage. Also, on a JB the mids are so pronounced you can never scoop them, not even a smidge. Whereas with a Duncan Distortion, you can get the Rhoads Diary of Madman
Tone, or Testament or Jeff Hanneman tone, or even Kirk Hammetts Jackson tone by using what they used: the Duncan Distortion. You can arguably dial an approximate JB tone with the DD: not as warm, it's arguable, but nonetheless very similar.
Nothing against the JB: its magnificent, original, great growl, and compresses your leads for some great lead playing. When Randy & Eddie started shredding during the verses, fellow L. A. Metal ax heroes loved how the JB could go from rhythm to lead & back without kicking a boost pedal. But even back then, some guys (e.g. Jake E Lee) used a pedal to boost the tightness of the bass thru their Marshall stacks.
So I say, fix it at the source: get the Duncan Distortion, if you play hair or thrash metal rhythms, if you play lower wattage amps, solid states or pc sims.
(there's a link below to my youtube discussion of the DD on my Charvette, & i also did a JB with the same exact settings if u wanna compare.)