Which of these url structures is better practice

I just had a quick question about URL structures. Out of these structures which is more commonly used, and should be used more for best practice. Or if you had any other ways that are even better, that would be appreciated.

Create all add type pages with a prefix of add- and then the rest

http://ift.tt/1xPaKFR

or create a folder for all adding functionality

http://ift.tt/1IfZqSS