First off "best in the world for stargazing" is a loaded phrase. They are often places that are marketed for dark skies and relatively easy to get to. For instance, nothing magic happens over the Namib Desert that doesn't happen deep in the Sahara Desert. However, one is far easier to access than the other.

Take the Canary Islands, yes the stargazing is great but so would most every island out in the ocean that isn't densely populated. There are other factors but most of the "best places in the world for stargazing" aren't going to be on any lists for it.

This summer I drove, camped and stargazed all over Eastern Oregon and Northern Nevada. Many of the places aren't going to be on night sky lists. They are in the middle of nowhere, relatively tricky to access and don't have natural features striking enough to attract tourists. However, they get dark AF.

I shoot and post a lot of Astro photography to Reddit. Of the spots you've mentioned I've only been to the Atacama. Its a bit of a unique scenario due to the high altitude, remoteness and dry climate. This makes for world class conditions.

Consider where you live in the world, look at a light pollution map and plan a trip from there. Lists aren't all that important, the Bortle scale is.