ng-style or style attribute with binding? Which is better? Which is faster? What is the difference?

Question

I am optimizing my large application. I am confused between following two approach, please help to decide which one is faster.

Inline style attributes

Answer 1

One time bind is available after Angular 1.3.

You can do this way without depending on third-party libraries:

I didn't measure the performance, but I'm pretty sure that its better than without the colons.