Which Projects Need React? All Of Them!
Sacha Greif

IMHO, the best tool is the one that you master well. Then at some point your career, comes another tool so powerful that you have no choice but start from scratch to learn and master it.

If you master well AngularJS today, React is not such a huge improvement to switch. If you’re still writing pure JavaScript +CSS + HTML, then you may want to consider.