I guess the real question, regardless of the bass involved, is this: if you had to choose one of two basses, would you play the one that sounded best to your own ears on stage, or the other one that everyone in the audience tells you sounds better than the one YOU like? I always did the former. Fortunately, whenever I played a P on a gig, I liked the on-stage sound and got compliments from the audience to boot. I like J's too, but they were always a little bit harder for me to hear in the mix than a P.