Re: Fender bass battle
Man, I like both so very much...
The J is more versatile, but the one thing that the P does it does well and it tends to sound good in the mix with very little tweaking. The same is also usually true to me for the both-pickups sound of the J, though, so don't think that the J will force you to spend a lot more time dialing in a useable sound.
Oh, and just to pre-empt anyone who reccomends a P-J as a best-of-both worlds option, that's not quite an accurate description. It WILL allow you to get a P sound and will also allow you to get a Jaco-esque J-bass bridge pickup honk, but the sound of the two pickups together is quite unique. It's cool, but it's not the same thing as both pickups on a Jazz -- which is my favorite Jazz sound, so I miss its absence.