For a beginner I'd recommend React over Angular, simply because React DOM itself isn't too big and has a relatively kind learning curve. Angular has a pretty steep learning curve, plus it's a great big opinionated framework with the lot, so it's a little less beginner-friendly.
Ultimately though any of them will be fine so long as you've already learned ES6 and simply add pieces to your knowledge. The learning pitfall I've seen many times is people trying to learn (for example) React + React Router + Flow + type theory + functional programming + ES6 + Redux + webpack + the kitchen sink all in one hit. It's hard for a beginner to know where each part starts and ends.
Instead learn ES6, then add React DOM, then add React Router, then add Flow, etc.