To the original question, I ended up playing a P for several reasons (despite owning around 24 basses at one point). First, it is unassuming, relatively inexpensive and robust/sturdy. I had owned a Dingwall AB-2, which was great, but it was an expensive bass that everyone wanted to touch or play (fancy woods, fanned frets). Second, the P works well in terms of setting up/dialing in quickly. It only has one pickup, a volume knob and a tone knob. I've had other multi-pick, multi-control active basses, which gave me more things to adjust and play with, but I'm not sure I ended up with anything radically different in terms of tone. This leads to my last point - the P bass is the most recorded, most heard bass sound - to most people's ears, it sounds right and fits into the mix in a way that it's supposed to (again, less messing around trying to get the right sound). My only concession to modernity is that I play a 5 string because I got tired of down and drop tuning.