The real appeal of these versions, I suppose, is you get to play them on these new consoles. The controller you're playing with will be better, there's video sharing functionality, and you don't need to plug in your old system again.
+ Maybe best 2D platformer since Super Mario Bros 3; + Definitely the best on next-gen; + Remains just as compelling and enjoyable as it was at launch
- Not worth double dipping on