Fedora
This distribution is pretty well known in the Linux community, and it has a pretty large package repository on top of being known for being quite stable. Although he stated he doesn’t really care about the distro he’s running, Linus Torvalds, the creator of Linux and Git, stated he uses Fedora as his daily driver, and to be honest I probably would too if it weren’t for Arch’s AUR and minimalism. (And let’s not compare Linus to myself, he is a freaking genius who created the most successful kernel ever, I’m just a Linux and Emacs enthusiast, I’m just sharing my opinions here).
I also think it’s pretty well fitted for Linux newcomers, although maybe not as much as Pop!_OS.