I don't know what the best bell is, but the Knog Oi is one of the worst I've ever wasted money on. It looks cool and I really wanted it to be good, but it was awful. It sounded great when it was not mounted on the bars, but as soon as it was mounted, the sound was deadened to the point of just making a dull "clink" noise. I tried adjusting how tight it was mounted to the bar with no change. I purchased 2 of them, so I thought maybe one was a dud, but the other one was exactly the same.