the nailbomb has darker upper mids, but a lot more top end than the diver
having tried the JB, motor city afwayu (Jerry Cantrell's pickup since 2009), the nailbomb and the holy diver, all in les pauls, I gotta say the diver is the best AiC pup ever
smoother and more open than all the others mentioned
for some reason, Tim almost always recommends the nailbomb for heavier rock (maybe it's his personal favorite?)
the nailbomb is a good option for Down, since they use very hot pickups (anderson h3+, duncan invader, emg 81)