Whichever works best for you. :D
Going back to your originial question... yes SEP v14 is worth an upgrade. I have just completed upgrading 5 different academies to SEP v14 with two more academies next week and so far, it's doing pretty well actually. And I am happy with how it's performing.
So, yes, I'd upgrade to v14 if I were you. Start with small numbers of clients, do some testing and if you're happy, then do the roll out.
Good luck!