End of the day it shoudn't be about the OS and that's not the case for me.! . . . Like I say couldn't careless if it run Wonker vision.
My machines only run MS OS because thats whats needed to run Mach3 and they don't have anything else what so ever installed.

All folks want is a controller that is easy to install, setup and ultimately easy enough to use. They can't or don't want to mess about with OS issues or learning some coding skills to make it work like they would like. They want sympathetic help when they are challenged not made to feel like idiots because they can't do the lingo.!! . . . . Like John this has been my experience and feed back form others with the EMC or linux CNC crew in the past.

They both work Well just Mach suits newer users and experienced users alike better IMO.