Animal Crossing & Animal Crossing City Folk were both awesome but I didn't like Wild World much.
IMO, playing AC on a big T.V is much better. I didn't like the fact that I couldn't see where I was going due to the DS's small screen. Plus, I don't play games outside of my (or someone else's) house.
AC (GC) > City Folk > Wild World and I will likely skip New Leaf in favor of the eventual ACU. Though, I may not even get a Wii U...