Last year, Forbes covered gaming on Linux by testing a couple of Steam games across a few distributions including Pop!_OS. The author, Jason Evangelho, had varying success, however, had great success with Pop!_OS due to its simplicity to get things working.
Links to the different distro tests are in here: https://www.forbes.com/sites/jasonevangelho/2019/03/15/linux-gaming-usability-and-performance-across-9-distros-introduction
Pop!_OS article: https://www.forbes.com/sites/jasonevangelho/2019/03/20/pop_os-18-10-linux-gaming-nvidia-radeon-user-experience