Go for Materialize.
I don’t know why people downvoted your question. It is a legitimate question. And though Angular Material looks like a more attractive choice as it has the famous word “Angular” in its name. But it is definitely not the right choice. It may have better integration with angular but a good programmer can integrate Materialize equally good.
Angular Material does not have that many components yet. In fact for some of the components, it does not even have proper examples.
I started a project in Angular Material but then shifted to Materialize a because as of 20th September 2017 it is much more comprehensive a library. And is also documented properly with so many examples.