Big fan of both here. I'm going with Geddy for the win though. He can play circles around John Paul Jones, plus he played on a stream of albums that IMO rival the Beatles(Farewell To Kings-Moving Pictures).
I'm not seeing how Geddy can play circles around JPJ. I would put their technical skill pretty close, and maybe even give a small edge to JPJ for his overall fretboard knowledge. That guy can run from lowest note to highest on any bass, and always stay incredibly musical while doing so. He is definitely among the greatest to ever play the instrument.