Don't Install iOS 10.3.3 If You're Worried About Problems
If you're having an excellent experience on iOS 10.3.2 or below, and iOS 10.3.3 fails to excite you, consider holding out.
iOS 10.3.3 users are complaining about Wi-Fi issues, various issues with Bluetooth, activation issues, problems with various third-party applications, installation problems, UI lag, random reboots, and battery drain issues.
If you're feeling comfortable with your current version of iOS you might think about waiting for more iOS 10.3.3 feedback to arrive.
Remember, there's no way to downgrade to iOS 10.3.2, iOS 10.3.1, iOS 10.3, iOS 10.2.1, or iOS 9 so you'll want to be one hundred percent sure about the move to iOS 10.3.3.