However, iOS 10 still has some disadvantages you need to be aware. One is iOS 10 does not support iPhone 4S or previous iPhone devices, and it is only available on the iPhone 5 and later, iPad mini 2 and later, iPad 4 and later, and the 6th generation iPod touch. Another is Apple always puts users' privacy in the first place, so it's said that iOS 10 may work on a rootless security system to prevent the jailbreaking. If you'd like to jailbreak the new iOS 10, it would be a great headache problem.
By making it clear what advantages and disadvantages iOS 10 have, whether upgrade your iPhone iPad to iOS 10 from iOS 9 or not, it all depends on you.