Why use Pop!_OS? I guess because the name makes you look like a 1337 h4xx0r.

Joking aside, Pop is generally liked for its easy-to-use interface. System76 has made a well-polished suite of software, and they are in the process of replacing GNOME with their own DE to make it an even smoother experience.

Of course, if you use something else (I prefer openSUSE Tumbleweed), you can just stick to Flatpaks entirely without having to get concerned about snaps.