Why do you ask? Do you actually get to make this choice? One implies a two year contract. The other, who knows where you are getting that. Who, besides a scammer on some website, is selling the iP5 64 GB for $99?
The 5 is buttery smooth and powerful. Not sure why the S version is what the non-S version should have been from the start--there's a reason why there's a non-S version and an S version exists.The 5s is what the 5 should have been from the start so I'd go with that. It is buttery smooth and powerful.