Well actually not every game has been tested fully, and so we don't know the level of 'accuracy' or how well each emulates certain games. It's possible Canoe could have more 'accurate' emulation including speed and timing for certain games than SNES9X does. Maybe Canoe emulates a problematic game that SNES9X 'barely handles'. So there might be undocumented benefits to using one over the other. We can't say for 100% certainty that there are no differen ces in 'gameplay' between both emulators.