Thanks. I think for me it will be easier to buy. But they're not mentioning the versions, only Windows 10 Home or Pro.The Windows 10 OS is available for a Free Download from Microsoft, and you can burn your own Flash drive with the Media Creation Tool. You do not need to buy a flash drive with the Windows 10 OS on it. You can purchase the Windows 10 License (Product Key), if you don't have it.
The version of Windows 10 (ie) Pro or Home, is unlocked by the Product key that you use.
If you decide to buy Windows 10 USB flash drive, the seller should provide what Build (ie) 20H2, Of Windows 10 they are selling.