Answers (5)
im gonna say DS because the games for this thing are still widely being possessed while Wii has a interesting reputation of becoming boring quickly (id say it depends on the games you have) and the ipad is not only expensive its very limited in the things it can do, sure there are a few cool apps but all the good ones you have to constantly pay for and another newer better one may come by, plus the ipad 2 just came out. so the whole process is still just developing and not very well.
While the Wii is quite interactive (and no you don't have to stand all the time) its simply another game system same as DS, i think the DS is more convenient though. but it all depends on the games you want (Zelda and supersmash for Wii)
so i rule out the ipad and suggest you do some available game research on the DS and Wii
I would get a Nintendo 3ds because the iPads are losing a lot of good games because makers are running out of ideas. The Wii is a great system but Nintendo has dropped the eShop function and the games aren't as good as the ones you can get now. I would get a 3ds because there are so many games and so much variety. Plus, it is compatible with amiibo.