Who's Right?

Apparently, web analytics is not an exact science. Here are three web analytics versions of the same period: from November 23rd to December 23rd (Top: Ghost Analytics, Middle: Plausible Analytics, and Bottom: Tinylytics). Plausible feels conservative, with about half as many unique visitors as Ghost, while Tinylytics seems to overestimate. The patterns are barely the same, too. Who’s right?