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Anecdotally, yarn is significantly faster. Makes a difference if you have lots of dependencies.

I used npm a lot and had sporatic unexplainable errors. I haven't used npm 5 to say if it's been fixed, but that turned me off.

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I've had this issue too with npm on my build server - sometimes things just fail, maybe it's flaky network, maybe it's some package update that didn't quite go as planned, but yarn seems to solve it and works a lot faster to boot, so I'll be sticking with it for now.

npm5 and 5.1 has improved performance significantly so that it's comparable with yarn.

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