Why Defer Updates?
You can defer updates to ensure they’ll receive more testing before they make it to your PCs. Enabling the “Defer upgrades” option puts your PC on the “Current branch for business.”
Microsoft will roll feature updates out on Windows 10 Home PCs first, and all those home users will effectively act as beta testers for you. if there are any problems with the update, they should be found and fixed by the time they become mandatory on Windows 10 Professional.
If you’d like to test major updates to ensure they don’t break important business software, you can defer upgrades. But, as MIcrosoft warns, you won’t get new features immediately. If you’re an enthusiast who wants to get the latest features when they’re available in Windows 10 Home, don’t enable this option. The Windows Insider testing process should hopefully catch most bugs before the update rolls out of Windows 10 Home PCs, anyway.