Okay my friend, so I can only speak from limited experience. I have played both those sets of pickups on a maple neck , alder body jazz bass. From recent memory I can tell you that the Duncan quarter pounder J's have a massive, ballsy, grinding tone that really does sound great. Lots of harmonics, lots of lows , and lots of mids, pretty much lots of everything. I think that if you were to play a jazz bass with the quarter pounder jazz pickups you could cover a lot of ground in terms of musical styles and really having a massive , no bull crap tone. Now having recently played a set of the Pure Vintage 74' Fender Jazz Bass pickups, I can also tell you that they have a much different tone. The way that I would describe them would be that they have a nice , fat and yet compressed tone with an open mid range and an "airy-ness" to their harmonic content. The low-end seems to be dominated by a nice complex low mid-tone, and the highs are well-rounded but not overbearing. For me, I would definitely pick the 74's over the Quarter Pounders simply based on the classic sound and well-roundedness of the tone of the 74's. If you're looking for a more versatile , modern sound, applicable to a wider variety of hardcore musical styles, with a super fat punchiness that says "f@$k the man" , then I would go for the Seymour Duncan, Quarter Pounders. Good luck and happy bass!
That might be what I'm looking for.
My AmStd jazz sounds nice but it's a little too friendly for my tastes. I definitely want more punch and growl to my tone which my VT bass helps with. However, it would be nice to have more of that sound inherit to the bass.