I have SON Edelux II on my Platy and had B&M on my Homer. It might have been the mounting angles, but I thought the light was brighter and better with the SON, so I switched the Homer to it. When you're here end of October, perhaps we can pedal together in the dark and you can see your B&M next to my SON and then decide.
I suggest a ride over the Ben Franklin bridge to NJ--It's one of my favorite rides. Cannot help with the connections though. @keystonebikes does excellent work on all my bike issues and installed it for me. They "get" Rivendell and will be at the expo, as well as the party they are hosting Saturday night. I'm sure you can get some good info from them and Riv..
Perhaps you-know-who-we-want-to-come will join us. :)
https://phillybikeexpo.com/ Oct 29 and 30, downtown Philadelphia, easily accessible by car, Septa, NJ Transit, Amtrak, Greyhound, etc., and bike! They also have free valet bike parking inside.
Roberta