Bi-directional data binding and the isolation between style, structure, and logic felt was less productive. Angular has some nice properties, like dependency injection built in, but you can circumvent many of those needs with a functional component tree in react (or limit the surface area across components). The simple fact that you need @Output event emitters to handle callbacks is a good example of how bloated it feels.

It may be that I don't know nearly enough about Angular but even after a year of doing my best to learn the idiomatic Angular ways I wasn't impressed.