I'm leaning more towards the 3DS since that will offer you new releases in the future as well as some very good games that are already out like KH3D, Fire Emblem: Awakening, Pokemon X/Y, and Dead or Alive Dimensions. It plays DS games as well. Also if you don't care about the 3D functionality you could always get a 2DS instead of a 3DS.
Lightning__Evil's forum posts
I guess we shall, as always I want more release dates. FFX HD, PS4 I'm looking at you. XV and that I realize its too early for that but those two we should have dates for already/soon