should i update my iohone to ios 11?

Yes. All your apps will be compatible on iOS 11. iOS 11.3 is coming soon but it will come with a new feature on your iPhone which is only compatible with iPhone 5s, iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, iPhone SE, iPhone 7 & iPhone 7 Plus but anyways they will come with a battery CPU changer in the battery settings so your CPU won’t go bad like when you got your iPhone. That’s why you should

Apple software should always be updated to the latest version when a new version is released. New versions give you additional features, defect fixes, and/or security updates.

I updated to 11.2.5 but I would downgrade to 10.3.3 if I could.