For me it's Stingrays. I absolutely love the sound of them when other people play them but hated my old 3 band, could not get it to cut in a live setting, was all boom and clank. Recently saw a band in Oxford where the bassist was using a SUB and it was again a bit indistinct and boomy.
However, I am once again dipping my toe into Stingray infested waters! I think they're just very sensitive to EQ'ing and I think last time, I was less experienced, I just did what a lot of people do and maxed the bass and treble boosts on top of my amps EQ. Which obviously is quite extreme. I can make it work this time! Damn it! That tone is divine.