VS. Just comming from the guitar center and I'm perplexed which one to get. I'm using a Fender Precision Bass with Chrome Flatwound strings. I was at lunch break from work so I didn't have my bass but used a Fender Precision with roundwound strings in the store. Here's what I've discovered..... Big Muff: Excellent tone, the best distortion tone I ever heard, ever for a bass. The only down side is it seems to be a one trick pony. I can't really play around with the distortion as much as I'd like. I couldn't get just a hint of fuzz, or light distortion. In fact, it seems I could only muffle the distortion or have it full blast. Another thing I'm concerned with is soundind too much like other bass players who have this in their effects chain since the tone is so limited. But it is the best distortion tone I ever heard though! Hands down! BOSS ODB 3: Excellent pedal. I like the Eq functions on the bass and highs which are seperate, the ballance and gain knob along with the over all level knob which makes this pedal very, very versitile! I can get just a light hint of distortion, some grit, to heavy fuzz and even death metal (which I'm not a fan of but it's in there)! The tonal options are good but doesnt sound as horny as the Big Muff. So in conclusion, sacrificing one absolute gorgeous tone (Big Muff), for the versitility of creating ten or more other tones (ODB 3), I think the Boss pedal wins this in the bang for the buck category, hands down. Plus, it's not as big as the big muff and leaves more room. But since this a discussion forum, I'd love to hear your opinions on each of these wonderful pedals!