Iszi's questions

I recently read a bit of an article on HowToGeek that has me scratching my head a little. I've got fairly little experience with Linux though, so forgive me if this is entry-level:

"The tracepath command is similar to traceroute, but it doesn’t require root privileges."

http://www.howtogeek.com/108511/how-to-work-with-the-network-from-the-linux-terminal-11-commands-you-need-to-know/

How do traceroute and tracepath perform a similar function, differently?

What does traceroute do, which requires root privileges, that tracepath doesn't?

Are there scenarios where one should prefer tracepath over traceroute, or vice-versa?