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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Kelvin and Celsius is not comparable as they are used for two completely different things, even in scientific settings. Celsius is a far more convenient unit to use when working with temperatures around room temperature. Kelvin is mostly used in physics in order to make thermodynamic calculation easier. So there is no problems keeping both Kelvin and Celsius.
However Celsius and Fahrenheit is another story. They are both used in different domains for historic reasons. It would indeed be more convenient for everyone to switch to a single unit. People just keep using the unit they are used to as it is more convenient then switching. That is until it becomes more convenient to switch. And currently more people use Celcius then Fahrenheit and more people switch to Celsius then switch to Fahrenheit. So we are slowly migrating to Celsius and Fahrenheit will become historical.
There is a similar history with miles and kilometers although this is unrelated to the temperature scales. And as with temperatures more and more people are switching to metric. Even the US officially switched to metric in the 70s and all government agencies have been using metric internally since the 90s.
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