Hey guys! So here' my pickup history...
BARTOLINI's all the way!!! That being said, I ran my main MIM Jazz (the one they did an article on in BP mag) with a front bart and a rear passive EMG, running them both thru the onboard Aguilar OBP3. I did this when the rear Bart stopped working and became microphonic- super rare occurrence, but it happened. So it was hybrid for years- until now.
As of December 2013, I was fortunate enough to get some Aguilar 70's single coils put into that bass. They are different and amazing. I wouldn't say they are EQ'd diff, but def have their own sound, where the Bart's tend to be smoother and not get in the way of any sound (letting your bass and all it's parts speak freely). So far, I dig the Ag's.
My USA Lakland 55-94 has the MM-J config with a Bart preamp- and I won't touch it! Look up Christina Aguilera's song "Impossible" and you'll hear that bass and it's silky milky booty.
Lookup "Uriah Duffy Bass Bash" and you'll hear the first gig I did with the Aguilar 70's in my jazz.
I have heard that Barto has gone thru some great changes recently- I must investigate!
Hope any of this helps!