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