I thought we had this thread like 2 months ago?
In any case:
Worst is Wiiware because upscaled graphics somehow manages to look WORSE than the original, and the soundtrack was butchered from a decent chiptune set, to a droned out badly mixed, and underimpressive OST that only managed to have one justifyable decent track (moonsong).
Best is CSE2 because 60FPS (togglable), Widescreen (also togglable), Not shitty text alpha blending, works on literally almost anything because self-compilable, and is super easy to modify to match how you want to play the game. (I don't think you can drag and drop OSTs from other versions of the game, at least not yet but I can't imagine it being hard to set up since we have freeware compatible .dll source code for that)