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Kega Fusion is a very good emulator with high compatibility. It is easy to use as well. GenesisPlusGX is also very good with high compatibility. The only thing it lacks is 32x support. The port for RetroArch adds shader support, dynamic sync and the other features of RetroArch.Exodus is cycle-accurate, but and has high system requirements. It is the newest Genesis emulator, and is likely far from complete. It currently only supports the regular Sega Genesis and no other systems.