Compeling reasons to upgrade from 12 to 13 or 14

Hello,

I use the Teamviewer 12 free version to provide tech support to my family. I was always upgrading to latest version until 13 came out and it would not talk to version 12 remote hosts.

What improvements or new features do versions 13 or 14 bring to the table for someone like me? I mainly use it for unattended remote control and file transfer with the occasional use of the remote print feature. What are the drawbacks of upgrading?

The computers are all Windows 7 or Winodws 10. Would be nice to remote control my Dad's new iPad too.

thanks for your thoughts,

Clark.