My advice is to hold off installing either release for the time being. Complicating matters somewhat, if your computer meets the Windows 11 hardware requirements, you might additionally see that OS as available for installation in Windows Update.
Microsoft makes it easy for you to opt into beta testing, but not as easy to opt out. Once again it’s that time when a new Windows 10 feature update is imminent - in this case, version 21H2, the Windows 10 November 2021 Update - and when you need to decide whether or not you want to participate in its unpaid beta testing process.