Seems like comparing apples and oranges to me.
The Ludwig Supraphonic is like a pair of comfortable slippers, and like a Fender strat, it has been a staple of recorded and live music for decades. It is ingenious in it's simplicity...you turn on the snares and it sounds good. Ludwig figured something out and got the formula right...thousands upon thousands of ludalloy snare drums in schools, bands, concerts, recordings, etc happened for a reason. It's the snare sound as evidenced by its history.
The Rogers Dynasonic's genious lies in its complexity...Joe Thompson et al came up with a great idea. There are a minority of us that want the huge variation in sensitivity and sound, as well as the sheer beauty and cool factor that a Dynasonic offers, especially Rogers fans. However, while some people are into the complexity, and enjoy all the fine tuning and theory behind a dynasonic, most drummers just want to play a snare that needs as little messing with as possible. To adjust a dynasonic once every three years is the exception...I just looked on ebay and there are 6 Dynasonics...3 are missing the frame so are not even usable the way the snare was designed.
Brand loyalty plays a big factor here as well...if you are a Rogers guy, why would you play a Supraphonic? Messing with a dyna is part of the fun. But you gotta wonder why so many Rogers players, especially ones with 200 dynasonic snare drums, would rather play Powertones!
I hope this doesn't offend anyone, but to me it is hard to make a Supraphonic sound bad, and it is hard to make a Dynasonic sound good. If I was put in charge of finding a metal snare drum for the average drummer (and not a gear dork) to use on a gig, I would go with a Supraphonic...I wouldn't even consider a dynasonic...and I'm a major Rogers fan! Now wood, that's a different story...a Rogers wood Powertone is just a beautiful, perfect snare drum, and to me offers more than Ludwig's equivalent, the Jazz Festival.
I agree that a Supersensitive is a great snare, and it really is the best of both worlds.