I think the DS list hands down!
A lot of clever people have already stated why it should be that way so I won't repeat it.
And besides: I think that a game should belong to the list of which is the OLDEST system it can be played on.
A gameboy color game that CAN be played on a GBA (Like zelda oracle of... with bonus content etc.) should belong to gameboy color, it aint a GBA game!
this is DS games, and can be played on a DSi, but it will affect gameplay only in the way that you can have a little extra stuff, not relevant to the game itself... an extra pokemon here, send a photo in the ingame mail there... snore...