To paraphrase a photography saying - the best bass is the one you have with you at the time.
Oversimplifying it a bit, but not a bad thought. However, it's before the gig/rehearsal/whatever that troubles most folk with GAS. The truth is probably is that there is no 'right' bass, which accounts for why people have various types (or even lots of the same type). Use whatever makes you feel comfortable with your place in the ensemble. To this end I give you Geddy Lee, well known bassist in a certain rock outfit - off the top of my head: Precision; Rickenbacker; Steinberger; Wal; Jazz bass (although I think that the J first appeared briefly on Permanent Waves/Moving Pictures). They all worked and they all sound like Geddy.