I don't feel able to rank pickups brands. I've many Duncan's here but also many other products, modified or not, mounted or on the shelf - not to mention my own transducers.
Some were expensive, some were cheap. Some costed nothing because they were gifted to me. Their financial value or origin is not even a criterium in my mind.
Duncan, Lawrence, DiMarzio, Armstrong, Rowe / DeArmond, Jackson, Fender, Gibson, TV Jones, Burns, Hamer, Kinman and a bunch of other (in)famous boutique PU's that I won't list because it would become to long.... I appreciate most of 'em for what they are, except when they are frankly unuseable (like a P90 sized "Rainbow" hexaphonic pickup meant to have belonged to Steve Howe: I just can't find how to use it, even instead of a GK3 or in my old Variax, since it would need an hexaphonic buffer to work properly and I lack of time or motivation to build such a circuit)...
Subjectively, I'd rather rank pickups according to their era. Nowadays, transducers are more consistent and their production probably much more controlled but when I play a "vintage" pickup, I often hear something embedded in my musical memory and I feel good. I must admit that I've modified many pickups and/or their wiring in order to emulate more faithfully older pickups, with a variable success... After all, it was already the case when I've mounted my first Duncan's four decades ago: my first SSL1's or SH1's were described as reproducing the tone of yesteryears and that's why I liked 'em. Apparently, I've not been able to change my mind in 40 years (except that I'm becoming an old wordy man derailing threads like this one). :-D
It's not to say that I dislike innovative products, BTW. I admire things like the Zexcoil design or the Ilitch noise cancelling coil (which really illustrates how to think "out of the box" IMHO. YMMV).
End of my rambling. Let's enjoy with our guitars: I rank it as one of my first pleasures. ;-)