For me, I own 17 basses of different makes and types. I don't have to make a living with them, so a "consistent" sound is not an issue. I love all of them for different reasons.
Because I don't have to commit, I love can say the following: Ripper - it's a beast, and it's great for playing '70's stuff. Thunderbird - best bass Gibson ever made, and it looks cool. '79 Stingray - Leo made it, and it's got that vibe the new Stingrays lack. '76 Rickenbacker - nothing on God's green earth, regardless of price, sounds like one. Gibson RD77 - Gibson's response to Alembic, and unique. Fenders - old reliable. Ovation Acoustic-Electric - bought in Korea, cheap, and actually sounds pretty good. Godin A4 - Upright sound in a guitar package. Peavey Dyna Bass Unity Series - Underrated, and mine has a Kahler Tremelo; Pedulla MVP 4 - damn, what a fine instrument, and love the barts and electronics!; Alembics - finest basses on the planet, period, IMHO.
If I had to commit, however, it would be my '73 Jazz. Not because it sounds the best, but because it feels the best physically. It feels like an old shoe - comfortable. I can get many more sounds out of my Alembics (which I absolutely love), but they're not as comfortable. Then again, they're not CUSTOM Alembics, which would be made to my specs. This being said, my '73 Jazz comes pretty close to being what I'd want cosmetically.
So, if it's about commitment .. I'll take them all.
Alan