Hello!
I have tried both, But have tried the New american standard more because i own one, and judging on Mine, and my bass tutors MM J bass, The MM cuts through better, the sound is more penetrating, but the Jazz gives Less range in tones, but the tones it does give are the best tones ever.. My Jazz is alot more playable, due to the set up, so i guess i cant really compare the two that way,
LOL