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The navigation system is a pretty big difference. I don't know that I would say it's better, having had both, but it's different. Has a different interface, and a lot of new functionality, birds eye view, speed limits, better voice recognition that is marginally less terrible.
You get the Enform app which is very cool. Remote start, locking, status check I like a lot. I've never renewed enform before after the trial but I will this time. The nav system gets you bird's eye map view, the new nav software has free HD Radio traffic vs subscription traffic in the 13 & 14 system, the new system has speed limits showing, you get Siri Eyes Free on the 14 also I think, but not the 13. If you're an iPhone user its very cool. The interface I actually prefer somewhat on the 2013 system.
I'm a new car person and I lease, so the new car will always be my choice, but really they are almost identical.