I’ve got both a 2 pickup Rapture J2000) and a Thunderbass ET5 The Rapture has a bolt-on neck and 2 Bartolini J style pickups, while the ET5 is a neck with Bart soapbars. I’ve also got a Nuance, also with an ebony board, a bolt-on neck and Bart soapbars.
In describing the difference between the Rapture J2000 and the Thunderbass, I can’t do better than Mike Pedulla’s description of the Thunderbass vs the Thunderbolt, as quoted by Lonnybass above:
“The Thunderbolt,being more of a jazz bass type of instrument, is punchier and focused, whereas the neck throughs were smoother and bigger sounding.” To me, the Nuance is sort of a happy compromise between the 2, and I expect a Thunderbolt would be pretty similar, since it’s a bolt-on with soapbars like the Nuance.
I love my Thunderbass! It’s a versatile instrument, for sure, but it’s not capable of the same kind of aggressive growl that the or Rapture or Nuance can produce. I think that might be due to the voicing of the soapbars and the electronics of the Thunderbass, because most of the other neck-thrus with which I am familiar have a huge low end (like the Thunderbass) and a very aggressive piano-like high end (which the Thunderbass does not).
Hope this helps!