I think people are just comparing these things:
EX4i:
> Rumor of it might being a clone of iplayer hardware with ability to play roms.
> Cheap looking packaging (questionable?).
> Movie player that can play all formats of video (correct me if i'm wrong).
> Rumor of near perfect emulation of GBA.
> E-Book reader?
> I forget but was there any mention of RTS, RTC, RTG?
DSTwo:
> RTS, RTC, RTG.
> Constant firmware updates so far.
> Multi Save slots.
> GBA Emulator with constant updates.
> Copy, paste, cut, delete.
> SNES Emulator (Soon to be released).
> E-Book (Soon to be released).
> Movie player (Soon to be released).
I guess it is unfair to be comparing the EX4i to the DSTwo since it isn't even finished yet. Also please don't flame me if I missed some features for either of the cards I was just trying to reply to zeromac's post.