I have writtern imperative UI in iOS, jQuery with server templates. I love react for its declarative UI, but when people ask how it differs from angular 2 or em

I have writtern imperative UI in iOS, jQuery with server templates. I love react for its declarative UI, but when people ask how it differs from angular 2 or ember, I don't have an answer. I tried angular 1 ages ago, and left it. Any concise answer on how react's declarative UI differs from a 2 way binding approach in angular (or if they have changed it that)?