I went for the Big Single in my (all passive) "51 P5 reissue" build; I'm a big fan of the single coil's broad frequency response, and clearer top end response...
51P5 in the middle here (great photo omitted here...)
"These pickups are all about huge, full, loud, aggressive single coil tone. They use the same magnet layout as the Fat Stack, and the resultantly big coil is about as much single coil pickup that can be packaged in a soap-bar cover. This is the ultimate pickup for the Jazz Bass®-on-steroids tone purist!"
Not sure where the quote within my quote of Chef is from. Nordy web
pages perhaps, which is cool---just kinda curious about the source.
But yup, it is prolly all true. Nordy pups...whew. Just gotta add a
word about Fatstacks. To me, they are like split-coils-on-steroids.
Mine are in the fretless (stealth) Valenti. Since this bass has an Ebony
FB, the Fatstacks move the "ebony/ash/flats tone world" a bit more in
the fretless P-bass (with TI flats) direction.
Mind you, it has dozens of different tones, but generally with the OBP-3
Aggie pre, it is mid-rich to mellow when run close to flat. I also
must admit I am a little conflicted about all the push/pull switches.
They all do something, and you can hear it, and they sound good.
But since I can live with most of them, I'm stumped as to how to deal
with all the subtle choices....
Yet, I must testify: I love the sounds it makes when stroked sweetly
and repeatedly....especially with TI flats in EADGC.
So, I guess it comes down to the single VS split coil THANG. Heck,
they are both great, no doubt. I don't have a clue about how to
help you choose. I just wish I had the same problem.
However, for what it's worth, when I ditch the old Barts in my 55-01, I
think it's gotta be Fatstacks and an OBP-3.
And yes, hum is so so so overrated!