Will my rooted Samsung Galaxy Notes 3 get Android update automatically?
I always upgrade my phone because I like to be up to date with sw; indeed I bought a Nexus 5 to get fast upgrades. This way I always have the latest functionalities and improvements. It seems that you will get the lollipop update (see here), so you may as well install it. If you cannot chose, try reading the change-log to see whether there is a Stagefright fix or not. If there is update without hesitating!