From a mechanical stand point the 2014 are going to be a better car. Heat Extractor in the hood that will also add down force and a rear spoiler that looks to be more functional (adds more down force) and better seats if you want to step up and pay for them.
On the other hand the 2013s a lot of people think look better and you can get them at a better price, also a one year only car in that its the first year for the 1LE and last year old body style . The thing about going with a 2013 your stuck with how the car was ordered .
Your the only one that can pick what the most important to you.