Yeah, I guess not to many have tried out all three. Maybe they're like me: wanted to get the WMB, since they supposedly sound better than the others with Fender-type amp, but Menatones were backordered around here, so I got the BoR instead. And I've become really enamoured with the BoR, so I'm no longer interested in any other dirt boxes. Go figure...I doubt that there's many folks who have played all three.
I have owned the BoR and the Plexidrive. I have a strong preference for the BoR out of those two.