well, the jb is an humbucker, the MQ is an oversized single coil, so they're completely different in every aspect! think of three stratocasters playing together and you'll get an idea... :) warmer and bigger than a single coil, it can handle really raw distortions as well as bluesy saturated tones and sparkling cleans.
the Nailbomb is much more similar to the JB, but it sounds a lot richer... hi-mids are more pronounced and the lead tone is the best i've ever heard in my life. it's hard to explain exactly why, but if you are a lead guitarist you can hardly get a better tone. expressive, dynamic, singing in the most literal way, bright but deep at the same time. it sounds like a JB put off the wooden box it was trapped into.
a great set could be NB bridge + MQ neck.
Muse's frontman Bellamy uses it on most guitars, and even if you don't like Muse it's very versatile and surely will give you a wide range of great rock tones. even if you don't push yourself into those metal territories Nailbomb belongs...
[/quote]
great answer...but i want put a fernandes sustainer in the neck(yes,i'm matt bellamy fan too lol)...so i can't really choose between the mq and the nailbomb