What do you use for Mac and iOS video chat?

A picture is worth a thousand words, and a video will save you even more typing. There are lots of video chat options out there now for both Mac and iOS, and the competition is fierce. Which is your go-to client on either platform, and why?

Source: http://gigaom.com/apple/what-do-you-use-for-mac-and-ios-video-chat/

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