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It depends on how you define "the best caches". For example, you could get a list of caches with the most favorite points here:
https://project-gc.com/Statistics/TopFav
Just enter a region and a hidden date range.
And as others already said: Please read the FAQ and the help texts provided from geocaching.com and project-gc before flooding this forum with lots of questions which are all already explained here:
https://www.geocaching.com/help/index.phphttps://project-gc.com/Home/FAQ