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I have a 1/2 written post about this exactly. I took it out because it would have made this post too long. But TLDR: I found a few edge cases where using a real browser was easier to use than a headless toolkit. Definitely will be my next post.

Simulating clicking/mouse move events can be a pain for PhantomJS/CasperJS.

PhantomJS also runs some ancient version of WebKit, which means it is not compatible with modern browsers.

The point of testing in a real browser is to test in a real browser because your users use a real browser. Testing in a headless browser is faster, but proves nothing.