For the sake of argument, this includes the 3DS as well. You've got
DS Original, that was often described as looking terrible at launch as I recall.
DS Lite
The DSi including DSi XL (my favourite)
The Original 3DS including the XL model (Easily my least favourite)
The 2DS, including the XL model.
New 3DS, including the Normal and XL model.
DS Original, that was often described as looking terrible at launch as I recall.
DS Lite
The DSi including DSi XL (my favourite)
The Original 3DS including the XL model (Easily my least favourite)
The 2DS, including the XL model.
New 3DS, including the Normal and XL model.