Not sure what the difference is aside from the fact that the airport version is newer and 802.11ac. But I think I'd be ok with n, plus it's $100 cheaper. I'm looking for a network drive for time machine backups and sharing across all my Apple devices. Are there any useful features exclusive to the new version that I should know about? Besides 802.11ac. The two devices I'm looking at: Refurb Time Capsule (2011) Refurb AirPort Time Capsule (2013) I should note my connection is 25 down 15 up.