Oh man, how is possible to people still think about chankast as the main DC emulator out there? NullDC is by far the best emulator, and since it's source code was released, many improvements were done in every aspect of the emulator, every single glitch or bug that's not present in the game, therefore being caused by any emulation problems, that have been reported by users, were fixed, not to mention that the emulation speed is not a problem since a long time ago for most of people out there.
The same thing goes for GC emulation, the Dolphin emulator gets a new update every few hours, it runs almost every game that was released for GC and Wii, and SA2B is one of the examples of the games that runs perfectly, together with SSBM and many more, so the emulation problems or framerate argument are not valid anymore, of course there are people out there that can't emulate these games with the speed needed, but that's something we can't control even in the 2D emulators.