I have used react and angular2. Plus some other frameworks like polymer and vuejs. And have studied a few others. The one that makes me more productive is riotjs. Simple, minimalist design, yet it has the best implementation of components of them all. Components are custom tags written in html, with scoped javascript and css styles, in a single file. This is easier than React because your html is actual html, not trapped inside of render jsx functions. It is easier than angular, because it is simpler, faster to write and read.

It has one way data binding, like React, that is simpler to reason than 2-way in Angular. Riotjs is the framework that I recommend.