Don't Install It If You're Jailbroken
Developers have teased an iOS 9.3.3 jailbreak but it's still not available to the public so you'll want to avoid making the jump to iOS 9.3.3 beta.
You can't jailbreak iOS 9.3.3 beta and you can't jailbreak iOS 9.3.1 or iOS 9.3.2 which are the only updates you can downgrade to.
Currently, the only way to jailbreak iOS 9 is if you jailbreak iOS 9.0, iOS 9.0.1, iOS 9.0.2, or iOS 9.1. That could change in the future but nothing is confirmed.
iOS 9 jailbreak release date details still aren't clear so you'll need to remain patient as we push away from the iOS 9.3.3 beta release.