I've only used them on fretless but I've tried:
Picato- too much trebble in the sound and I had problems with two sets where the tape came unwound.
Fender- personal favorite, cheap, slightly textured feel, lots of bass in the sound , but only available in fours(being played as I type in my profile pic)
Status- again cheap, smooth feel, I've only tried these on my active five, a wide range of tone but this could be down to the pickups and preamp. I suspect that they are a bit less bassy than Fenders on a passive.