Learn React!
Out of all the libraries listed, React's API has by far the smallest surface area. With other frameworks / libraries, you will spend most of your time learning an API, but with React, you will spend most of your time gaining a deeper understanding of JavaScript.
Just to give a brieg example, to iterate over an array to create a list of items with React you use a built in JavaScript method and ES6 arrow function (see below psuedocode):
<ul>
{things.map((thing) => <li>{thing.whatever}</li>)}
</ul>
In Angular, you would need to use the Angular API's ng-repeat method, which will look something like...
<div ng-app ng-controller="MyCtrl">
<ul>
<li ng-repeat="(thing, whatever) in things">{{thing}}: {{whatever}}</li>
</ul>
</div>
React is not really all that hard to learn because of this, but the payoff for learning React is very high. You will be building better UI than you ever have. Angular 1, Ember, etc. will give you fish while React will teach you how to fish.
It is quite brilliant and I strongly recommend it as something to learn to improve your FE JavaScript skillset.