Im thinking of buying a Flash Cart for my NES/SNES Clone (the RetroDuo) and I was wondering, in your opinion, what's the best? I really want to emulate Earthbound on actual hardware without spending 150 dollars on the actual cart. Buying the actual Earthbound would have to wait.
SD2SNES is the most compatable. Here is the current incompatibility list: http://sd2snes.de/blog/status/compatibility it is the most expensive though.
The Super EverDrive, PowerPAK, or SD2SNES all play most of the same games. SD2SNES can play a few more but at greater cost. SD2SNES is "the best" in the compatibility area. Right now it can play mainly Mega Man X2 and X3 which only one other cartridge can do. These games are expensive so if you're interested in them, get the SD2SNES. Other than those two games, there isn't anything I can think of that puts it ahead of other cartridges. It has the potential to support Super FX which would enable you to play 2 games that aren't available or are expensive, Star Fox Competition Weekend, and Star Fox 2. The other Super FX games are cheap enough. There is no word about SDD1 or Super FX. The SD2SNES and PowerPAK can play Star Ocean, Super EverDrive cannot. So you see there is a short list of games that SD2SNES can play that others can't. Are those games worth the additional cost to you? That's up to you. SD2SNES does support MSU-1 which I nearly forgot. But if you aren't interested in hacks, homebrew, and other unofficial creations then you probably don't need it.