I've done sufficient with both Angular and React to have decided to go with React for next our project. Its a better fit for this particular project because the "reusable components" paradigm fits what we're doing, which includes building a non-model-specific framework that we can reuse for different models, where the framework renders slightly differently based on meta data provided with the model. We'll probably use Backbone for the model (& meta) & router. I like Angular, and would like to use it for a project that's more concrete and less meta.