Its clear that Precisions and Stingrays are amazing instruments that will both have a place in Music History. Both examples of Leo Fender & his various associates finest design work. They are both awesome, and you cant go wrong with either choice.
Ernie Ball does amazing work in San Louis Obispo, CA, it is a great company and they have come up with some solid innovations over the years in Basses for sure. The Bongo Bass is a great design. Its not for me personally, but I really appreciate the design innovation and creativity behind it. Their guitar innovations are even more impressive. True craftmanship and innovation from these folks.
For bolt on necks, the spoke wheel adjustment is the best design ever. And now you see new Fender basses with 4+1 headstocks (5 strings), and spoke wheel truss adjust. The new Flea Bass is a Stringray with a Fender Logo on an it. hmmmm.
To my ears the original Stingray with the 2 band eq is still the best. I have spent a lot of time with Headphone comparison and adjusting pickups, pre-amps and circuits to get my SR5 to sound more like a 79 preEB Stingray. The EB SRs sound amazing, but to my ears the originals got that thang that lead me there in the first place. Maybe listening to Bernard Edwards, Louis Johnson, Paul S Denmen, and others a lot (too much), playing pre EB Rays has me hearing things this way? I havent tried the EB Classic Stingrays with the 2 band, but I am certain they play and sound incredible.
I have a couple of MIA precisions. Love them. They have Jazz pickups at the bridge, which I thought I would use more than I actually do. The musicians that I play with, and the songs that I support live and recorded are never underserved when I use a P with flats, using just the precision pickup. It works.
The key is to find the Bass that allows you to most fully focus on what you are playing (song), and not what you a playing (instrument).
I suspect that the simplicity, combined with the amazing tone of the Precision, is why so many pros end up with these in their hands.
IMHO - The P enables bass musicians to get to the root core (zone) faster and easier, and allows engineers and sound producers to get to the essence of engineering and producing (dialing things in) faster and easier.
You cant go wrong with a Precision or a Stingray. I am lucky to use both.
If i had to pick between the two my forever bass, it would have to be the Precision Bass. This is based on the fact that my role musically has been to support artists and songs, and with a P Bass in my hands I get to that focus faster, and don't feel that there is compromise or sacrifice.
The larger neck also leads me to make more deliberate note choices, play fewer notes, and be more musical.
Just my perspective, but hope it is helpful.