if you buy a nintendo version... it will work with both... i bought a plain old DS wifi usb for my friends Wii so we can hook up online 39.99 at target... it says DS on the box but will support any wifi nintendo gadget they come out with...
the wifi max they have like 2 or 3 different ones
1. Wii/DS lite
from what i saw so far... the nintendos all seem to run off channel 1 so far only tested the Wii/DS lite, ill have to grab my brothers DS to see if it works for that as well
but really unless you have a hardwired computer "like i do" you dont need this, a home wireless system will be more than enough to support any wireless gaming system... you just have to figure out how to set it up..
for all you hardwired people its pretty simple just plug and play the wifimax had better range but didnt send signal anyfaster then the nintendo "buffalo brand" usb wifi they are the same price but the wifi max brand is capable of more than just playing nintendo systems you can run laptops,stereos etc. off the wifi max one even if it isnt super fast its an added bonus just a little more to setup intially..