SuperCard DSTwo has the most features, including very good GBA/SNES support and a hardware-accelerated movie player. R4i Gold (not Deluxe) is the more budget option that is generally as up-to-date with 3DS firmware as the SCDS2. Both support all DS games. [Rydian's Guide]Nevermind, I was in the wrong section, I was just seeing cards for 3DS that supported DS games.
I've read good things about the r4i gold 3ds card http://www.r4flashcart.com/8-wood-r4i-gold-3ds-flashcart-for-3ds-xl-3ds-dsi-and-ds-lite.html , and if emulation of gba/snes isnt your main objective, just nds roms, then get the cheaper r4i.Nevermind, I was in the wrong section, I was just seeing cards for 3DS that supported DS games. If someone can close this or delete, that'd be cool.
Thanks for replying though!