Long story short, you should update Core because you just should, and you should update Armory or you'll have trouble spending coins.
what version of Core should we be on now?
Err... uhh, don't you run XT or Unlimited?
sure, all but one to run Armory. you have a problem with that?
So you run a different client to make a statement but when it comes to actually using Bitcoin, you use Core.
I don't have a problem with that, I just think it's hilarious.
Edit: Oh... and to answer your question, you should use the latest version of Core and Armory.