Google trends are particularly difficult for this case because angular (the library) is not a "topic" there. React however is, though.

Stackoverflow tags comparison here: http://imgur.com/a/O3mSB

The tool used is here: http://data.stackexchange.com/stackoverflow/query/201360/que...

I felt happy looking at this. Angular has everything (the complete package of router, speed, and all the components you need), and was surprised why react was more popular