We started a project with Angular 1.5 , in the middle way I got introduced to Aurelia. I was skeptical at the beginning since many of components that we were gonna use was jQuery based or something that is already available in Angular. But once we started we felt that it takes a while to get a grip but in the end we have built something that is more cleaner, more modularized. Since it takes the advantage of ES2016, I found the syntax more intuitive. Angular Directives has been always a pain for me, but in Aurelia custom components/attributes are easier to write. Till date the experience has been fun.
I think I'm gonna stick with it for a while.