For a while, I really enjoyed hangouts.. but the past 2 years, google has systematically removed or obscured features, and it's just a bit of a mess now. These days, for skype, I typically just use the web version, as it's "good enough" for my needs, but none of them are really great anymore.

I've worked in one office that had Skype (for business) properly integrated, and it was very nice. But, like so many other things, they couldn't just fix bugs, and make sure to keep it working on new OS versions.