What's the difference between upgrading Windows 10 using Windows Update or ISO file

[Windows Central]

On November 12th, Microsoft finally began rolling out its first major update for Windows 10 (build 10586). On the same day, the New Xbox One Experience (build 10586) was made available to everyone too, and now we're just waiting for Windows 10 Mobile, which should be arriving pretty soon.
The Windows 10 November update, or version 1511, brings a lot of changes, improvements, and features that according to the software giant make the operating system mature enough to be recommended as a daily driver for organizations.

Full story from the WindowsCentral blog...