Please state which and why
Personally I prefer Skype, both in sound quality, and in being set up with the intent of not having push-to-talk, and of course because it's 100% free, Teamspeak is lighter ( not as CPU intensive ) and you can have an unlimited amount of people in a channel.
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Edited by Jornn_: 9/12/2013 1:32:43 AMSkype, because no reason.