Though I just got my Wii and it still has that new-gaming-system-omg-omg-omg feel to it, I still prefer the DSi. The Wii is very cool, but the DSi is much easier to handle. Unless you like throwing controllers around trying to find the senor, of course. I personally like the DSi because of Hatena and that you can go on the internet with it. That's my opinion.
To be honest, the Wii is better due to their special graphics and exercise. The Wii can be good for your body is you try some Sport games such as, Will Sports, Wii Sports Resort, Wii Fit, Wii Fit Plus+. With the DS/DSi, all you just do is sit on your lazy butts playing games with old Nintendo 64 graphics, with a few creativity games. Plus theres not that much good entertainment video games for the DS/DSi. So the Wii wins.
“If you want to be fancy, hold your pinky finger like this. The higher you hold it, the fancier you are.â€
Well, since Legend of Zelda: Skyward Sword came out my Wii has a hands down win at the moment, but, that's the only reason as to why I even touch my Wii, the DS has a much larger variety of games compared to the Wii, and the wireless play make it all the more enjoyable. In the end it all comes down to witch game you have for the system, or how many.
The harder the fight, the better the prize...well, hopefully.