Endeavour OS is exactly es stable as arch, and Manjaro tends to break more often than arch due to dependency issues. Debian and Arch are questionable for beginners, I would always recommend Mint as the first option for beginners. Also Mint has an easy NVIDIA setup, so I don’t think that is an advantage of pop OS compared to it. Nowadays NVIDIA is fine on Linux, especially on distros like pop OS, Mint or Aurora that makes the setup easy.
I find it kind of suspicious that the extension (the fake spot one to) are proprietary.