I've found two major benefits with yarn. First is package install time, like others have said it's an order of magnitude faster for projects I've worked on. Se

I've found two major benefits with yarn. First is package install time, like others have said it's an order of magnitude faster for projects I've worked on. Second is a little more niche in running a Linux image on Windows host via Vagrant/Virtualbox. Out of the box symlinks won't work so bin files often fail. I would also run into file locks when running npm install on larger projects often, to the point where I was having to run it 5-10x before everything would finish installing. You can instruct Vagrant to offer some support (setextradata VBoxInternal2/SharedFoldersEnableSymlinksCreate/v-root 1), or set an environment variable to key on and update any scripts to use --no-bin-links, but it's flaky in my experience. I never found a solution to the file locks with npm. I installed yarn on a whim on that setup and have yet to have any of those issues with it.