What is the best OS for Web development

Yes

There is no 'best'. Use whatever you're comfortable with.

the one you've got

Totally depends. I prefer Arch with i3 since I'm so much more efficient with it than Windows. Try out a bunch and see what you like.

Emacs

Web development : Windows
Web development with style : Linux

Temple OS

@sam9669 oh wow, what the actual fuck! Thanks for this. I had no idea such a thing existed! 😀

Ms-dos

Try notepad.

I'm kidding, please don't kill me.

I'm pretty sure any OS is fine for web development...

Windows will not work well at all. Some stuff straight up won't work on it, like flowtypes.
I use Ubuntu myself but I guess anything Unix like would work

It's not about OS but how you use it... Or something like that :D

Linux distribution known as Centos
Very useful

Kali Linux compiled with Bitbucket.

I'd avoid windows for web dev. Node mostly works on windows, but since most of the web is hosted on Linux you may find basic compatibility issues for some packages. Osx or Ubuntu are probably your best bets in terms of ease of use and compatibility.

At minimum you may find docs for how to set up things on windows to be sparse.

Red Star OS