Why install different cleaning methods?

I plan to do a clean install of El Capitan following a wave of seemingly random crashes and stalls. A search of the internet translates into two basic methods. It is on the Apple Support site and seems very simple and direct, involving little more using recovery menu How to reinstall OS X on your Mac - Apple Support. The other method is to format a USB stick or other external storage device and seems to be much more complicated (a tutorial of U-tube lasted 10 minutes to describe the method). Outside of masochistic fun, what is the advantage of using the second of these two methods, or, in other words, what are the flaws in the technique of Apple?

The first method requires to download the installer every time the procedure is performed and then wait several hours for it to download, in addition to having a reliable Internet connection. The other doesn't.

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Tags: Mac OS & System Software

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