Check out this guys chops, adjustments and TONE. I know, I know, Robert. The Fenders are nothing "special"
I don't mean it like that. My point is that I have played on $250.00/hour studio recordings with a $60.00 Ibanz bass, then played a vintage 1960's Fender once owned by James Jamerson and they sounded basically the same.
Preference is another thing. If the P or J is more comfortable, or the Thunderbird style, then that's the right bass for you. But for those who seem to regard - let's say a 1959 Gibson Les Paul as the 'Holy Grail' just because of it's vintage and the hype surrounding it, I think that's a waste of time and effort.
There are great P & J basses. Are all of them great??? No....