In reply to turkeysquirts.

There are a few problems with using both:

-Some screen readers do read the title text automatically, while some users do turn on the option. So if the title text is the same as the anchor text, then screen reader users hear the same thing twice in a row. And since screen readers read everything on the screen, that's a real problem for comprehension and user experience.

-But if the title text is different than the anchor text, then it mustn't contain necessary or even relevant information, since keyboard-only** and mobile users can't access it at all, and of course, many screen reader users won't, either.

-And what's the point of including irrelevant or useless information? Who does that serve? Will the users who can view or hear the title text appreciate it?

So no matter what, by using the title attribute, it's a bad user experience for someone.

** I don't think anyone has mentioned this so far, but title attributes don't show up on keyboard focus, and there's no technique to add info such as with the screen-reader-text class, as far as I know.