Jason Snell:

macOS sierra is coming Thursday. Here’s where you should install it:

• Nowhere, if you aren’t willing to constantly back up all your data and take the risks of having an unstable Mac in your life for a few months
• Nowhere, if you aren’t willing to use the Feedback Assistant app to report to Apple about the bugs you’re finding

[…]

iOS 10 beta is also due today. Here’s where you should install it:

• Not on your main iPhone
• Not on your main iPad
• On an iOS device that you don’t rely on

I made the mistake of trying out the public betas in the past and each time I regretted it. It’s not worth getting an early look at what’s new when you sacrifice performance and battery life. At the very least I would wait until the second public beta is released for both.