All the ones I own ultimately are here for the same reason. I played it and the bass said "Hi, honey, I'm home!!!" As different as they are, they all share that they have a certain resonance (not merely physical/acoustical) with me.
This^^...and being on TB too much for my own good. I was weaned on P-basses, and played them exclusively for years, before getting adventurous in the 90's. There was the 5-string phase, the experiments with fretless, and then my '98 Fender AmDlx J turned me into a J-bass afficionado. Also in '98, I made the mistake of picking up a Warwick for the first time, and it just felt so wonderful in my hands. I became exclusively a 'wick guy for a few years, horse-trading my way to the FNA Jazzman LTD 2002 that is my sole 'wick now. In 2005, I rekindled my love affair with the designs of Leo Fender, and 4 of the 5 basses that I currently have are from his mind. Here's the list:
Warwick FNA Jazzman LTD 2002 -only for high-profile special occasions, and studio work. This is my only instrument with active electronics.
G&L JB2 -I have a pair of USA-made specimens. The sunburst (with gun-oil gloss neck) goes nearly everywhere with me, and the honey-quilted-maple (with bird's-eye satin-finished neck -very fast) is used a bit more sparingly. Both have Hipshot Xtenders and rosewood fingerboards. I almost regret selling my Tribute model, but it was to acquire the sunburst. The JB2 is the ultimate evolution of the J-bass for me, and also ties in to my P-bass roots, with the body shape. 21 frets is also a nice thing, since high E can be useful in solos. This model is vastly underappreciated.
Squier Classic Vibe 50's P -purchased for a Green Day tribute act that paid well for the short duration of my time with them. I put in a Basslines Quarter Pounder, and keep it around for when a P bass is essential. This bass is the most likely of my collection to be sold.
Squier Vintage Modified Jaguar -It melted in my hand this last Black Friday, and the price was too good (with the GC discount, I was OTD for <$270). This bass is intended to supplant the CV 50's P as a "beater"; a bass to take to gigs in unsavory places. The neck is uber-fast, too.
This brings me to the GAS list, which is becoming comical:
G&L SB-2, because I have come to value the punch of a P/J configuration
Squier Deluxe Active Jazz V, because it is one of a very few 5ers that feels right in my hands, and the Squier quality and brand reputation have skyrocketed lately. Seriously, most 5ers don't feel right in my hands. There's been a Pedulla or EBMM here & there that have, but I get by with 4 so well, that the low price of the Squier becomes a factor, too.
I would also love to get a semi-hollow, preferably fretless, but both the G&L ASAT and Spectorcore lines have active circuits without quick-change battery capability, and that's a deal-breaker for me. I may end up building a custom Warmoth to scratch this itch.