Best OS?

[Cas]

It all depends on the things you are planning to do with the computer imo.
If you are someone who wants to get anything to work without doing much/anything you should choose Windows, as most applications are (only) compatible with Windows-systems.

If you are someone who loves to experience you should choose Linux, it's fully/almost completely editable as it is open-source. And it is very fast, even if you haven't got the biggest RAM memory.

And last but not least, if you are a creative person, you should choose Macintosh as it supports many creative applications and provides the best support for such apps.

[John23]

You should also look into your budget if your budget is enough then you can get window otherwise linux hosting best option.