Yarn feels more stable to me. I don't know how many breaking changes they've made but it sure feels like fewer (the version 1.x shows that). Also, I think npm

Yarn feels more stable to me. I don't know how many breaking changes they've made but it sure feels like fewer (the version 1.x shows that). Also, I think npm released it's lockfile too quickly. It didn't work for quite a while. Maybe it does now, I don't know, because any npm projects I have I have turned off package-lock due to it not working in the past. Yarn's lockfile just works, and always has. So I'll stick with Yarn as long as they just keep it stable the way it is.