Windows 10: 21h2 vs 21h1

what's the lastest

:)

 

Introducing the next feature update to Windows 10 version 21H1

21H1 - imminent- makes almost no noticeable changes and is almost only fixes.
Windows 10 Version 21H1 update: All new features, release date

21H2 - autumn - is the next major upgrade and the next to make changes to features.
Windows 10 Version 21H2 update: All new features, release date | WinCentral

 

Should I update to 20H2 or wait for 21H1?

Welcome to Ten Forums.

To go from 1909 to the next version, whether that's 20H2 or 21H1, is a major feature update that will install new system files and save your old system to a Windows.old folder. This can take up to an hour to install, whether you go for 20H1 or wait for 21H2.

The update from 20H1 to 21H2 however will then be a minor feature update, a small enablement package that turns on dormant features and installs in a few minutes, just like a cumulative update. I'd go for 20H2 now, the update to 21H1 will then be quick when it's released - plus it will be optional so you can wait to see if others report problems before deciding to update.

With any major upgrade, it is a wise precaution to make a system image of your current system before you start. Many here use Macrium Reflect Free for that purpose.

 

Advanced Appearance Settings Dialog Box for Windows 10 - Build 21H1

Ahh. I understand.
21H1 is a minor build, 21H2 is the major build.