I just spent the summer re-vamping an older bass of mine. I gave it a new paint job, replaced all the electronics, re-fretted and did the inlays over, even went extreme and installed ferrules for a thru-body design for my 5th and 4th strings. I get loads of complements, but no reacts to my playing until I strap on my Jazz. Like Joelb said, "they have a way of cutting through the mix..." that's my recording bass. It's so articulate! I almost feel like I should have saved my time and money creating my dream bass and found an original Jazz from back in the day.
Well, from my experience, it is really apples to oranges except for one simple fact. I would not bring my Musicman into the studio and expect it to be well received every time. In fact, i've recorded countless times with a musicman and its only really worked 1 out of 6 times perfectly.
To be honest, I shunned off Fenders for a very long time. I liked the musicman looks, the tone I got playing live. The necks are wonderful. The design is well thought out. But all that changed when I bought a Fender Jazz for $200. Since that fateful day I've found that Jazzes have a deeper tone. They have the ability to cut through a mix just the same by favoring the bridge pickup. They record well just about every time. They are always received well and I've never lost a gig playing one. Plus there are so many options to mod them to get your tone that its insane. With a musicman, your stuck with their tone, and their ideas. Having a Jazz opens up a world of possibilities.
So, my 2 cents. If you have to have just one bass, it should be a Jazz.

