f. boyle
I remember looking at them all. I finally decided on the BD because it did not use a waste gate. I believe BD's method of allowing exhaust pressure to open the butterfly against spring pressure provides the best low speed braking. I also wanted one that was vacuume operated, not electric or air pressure.
I'm sure other types fit other criteria better and work well for others but the BD 4" remote mount was the one for me.
For What It's Worth (FWIW)