For me the biggest difference is browser support. With React many libraries I have seen you can get pretty much running with IE9+ (often also IE8). In compariso

For me the biggest difference is browser support. With React many libraries I have seen you can get pretty much running with IE9+ (often also IE8). In comparison Polymer: You need more or less the newest IE browser to get it working fully: https://github.com/WebComponents/webcomponentsjs#browser-support https://github.com/WebComponents/webcomponentsjs#browser-sup... At the moment I also see that React has the bigger community/ecosystem but this may change in the future?!