Best: depends on needs and usecases. Obviously, the majority will name the distro they use here, because if they would think another distro is better they would switch.
Worst: either Pop_OS (the most pointless, with the killer feature of "nvidia blob out of the box", saving literally one command after installation), or Fedora (RedHat + too unstable + and too much RedHat new experimental shit being tested). Sorry for those who like those distros, but that's my opinion.