Clean Install: from Recovery Disk vs. from USB Flash Drive

Planning to do a clean install on my MBP running Yosemite. Have come across two ways of doing this: From the Recovery Disk or from a USB Flash Drive.
If the clean install can be done by using the Recovery Disk, why would you do one using a USB drive?
Is there any benefit to the USB drive method? Basically I want to know if one way is preferable over the other.
I want to make sure I wipe everything, as my machine's been slow/glitchy since OS X Yosemite was first installed/updated; I'm also not sure if I have picked up anything else along the way. (I'm pretty careful with my browsing/downloading, but I like to be sure.)
Thanks for any help.

The advantage of the USB drive is that you do not need an Internet connection.  If you do not have a solid Internet connection or the Apple servers are down, you may be dead in the water.  The only possible advantage of using the recovery option is that the latest version of the given OSX will be available. That may not be the same as what is installed on the USB drive.
Before you use either option, make certain that you have your data backed up.
Ciao.

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