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-sup...
At the moment I also see that React has the bigger community/ecosystem but this may change in the future?!
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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-sup...
At the moment I also see that React has the bigger community/ecosystem but this may change in the future?!