Saucelabs provides automated online testing with screenshots, which can be worthwhile to chcek out too.
Use the test suite that you are most comfortable with. I for example am getting to grips with Intern. Would I spend time with some other suite? Sure - but not until after I've had plenty of experience with this current one.
Yes, Mocha is very good too. Here's a good article on Getting Started With Mocha and Chai