Ask HN: Polymer or ReactJS?

Hi, I've been trying to decide between polymer and react.

And from one side i have react with their license+patents clause, but with good browser support and big ecosystem not following web standards.

On other end I have polymer with better license, following web standards, but it has poor browser support - I think IE9 would be good since i plan to write support software so I can't depend on userbase having up to date browsers.

And polymer demos on polymer website and even google io do some weird stuff like flash icons/checkboxes on browser tab focus (maybe this is accessibility feature? It's very consistent in how this works).

I'd really like to go with futureproof solution that would be based on standards but I'm having tough time to decide. What are your experiences using both solutions?