The most accurate and scientific is the kelvin scale and the SI unit of temperature and maybe their were different scales used in different countries but why use all three of them everywhere. Like we can use USA using miles while other countries use kilometer. But they both are not used at a single time at a single place. But why use 3 scales at once?
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[Relevant XKCD](https://xkcd.com/927)
There’s more than 3 measures (some are obscure), and there’s no real reason other than what different cultures developed and cling to.
That said, whether you’re team Celsius or team Fahrenheit, we can all agree that no one wants to use Kelvin. For convenience, we at least want the range of ‘common’ temperatures to be a sensible range, like 0 to 100 or -20 to 40 or whatever. Kelvin is great for scientific purposes and horrible for daily use.
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