I would like to clean install my MacBook Pro (Early 2015) with macOS Sierra which is also already installed up to the latest 10.12.5 version.
I Googled how to and found the macaw article How to Run a Clean Install of macOS Sierra. This article covers clean installing with a bootable USB flash drive.
I also found on Apple Support article macOS Sierra: Erase and reinstall macOS as erase and reinstall from the Internet or the built-in recovery disk. I also found the same instruction on Apple Support at How to reinstall macOS.
I want to do a clean install because of wifi connection issues. I'm currently using internet from an iPad Personal Hotspot. I have difficulty downloading MacOS Sierra on mobile data from Mac App Store or reinstalling from the Internet. Downloading 5GB from a coffee shop is also not convenient. I do have bootable USB flash disk of the original macOS Sierra (when it was first released).
May I know the difference between clean install from bootable USB flash drive and from the built-in recovery disk?