Earth doesn’t have to be the best planet in the universe. There are already two dozen known planets outside our Solar System that may have conditions more suitable for life than on Earth.
Potential «superhabitable» planets may be significantly older, slightly larger, slightly warmer, and possibly wetter than Earth. Life could also develop more easily on planets that orbit slowly changing stars with longer lifespans than our Sun. All 24 main contenders for the title of «super-survivability» are located at a distance of more than 100 light-years from us.
Being habitable does not mean that there is definitely life on these planets, it’s just conditions conducive to life.
