My vote is obviously for the Bubs. They sound great at all times, especially when you twist the throttle. Several years ago, someone posted something about how the Bubs were set-up/tuned for our bikes.
I also wear ear plugs, not because of the Bubs, but to just protect what hearing I have left from the air flow noise.

Blue/White 2007 TBA, Thruxton needles, Unifilter, AI removed, Polaris Bellmouth, Bubs, Nology Coils/wires, Lightbar, Ricor Intiminators, Hagon Nitros, Tall Sissy Bar w/luggage rack, Dart flyscreen & Lowers. 130 Mains, TrueGel Battery MG12-BS.