Joined the Apple revolution with a hand-me-down iPad 3 recently. Battery wouldn't hold a charge so I got the battery replaced. Upon restoring the system it automatically loaded iOS 9.4. With the following in mind, doing the upgrade might be a good idea.
Understand, I'm trying to bring a bit of Apple into my Android, Linux, and Microsoft worlds.
Apple's iOS 9.3 glitching some older iPads - CNET
Thanks to CNET