What is the best way to restore Windows 10?

Question

Windows

And what is the best way to restore Windows 10?:
1) From a USB flash drive via an ISO image, and then return it to its original state in order to completely format the disk (because when reinstalling via a USB flash drive, only quick formatting is available there).
2) Just from a flash drive via an ISO image?
3) Just reset (And choose to completely clean the disk)?
And why exactly?

Answer 1

What is the best way to reinstall Windows 10?

Depending on what you want to get in the end.
The right path is the one that allows you to achieve the goal with a minimum of costs.
And your goals are unknown.