Originally Posted by Gelatini Jejunator
If I remember rightly, you can transfer DSiWare to the 3Ds. Don't ask me how, though. So in this case, sell the DSi.
I can't refightfully say as I have never touched let alone owned a DSi(I don't even understand them), but I can say this. I have never heard anything good about those things. In fact I believe I had heard that the DSi XL...or it might have been some other DSi version was created as a replacement because the DSi was faulty or something.
My DS lite has always been reliable, and perfectly functional. So I vote the DSi for selling.