08-03-2013, 09:34 PM
Since there are only 3 of you I would probably say to just go with Skype. Mumble, TS, and Vent all require finding a server to connect to and sharing it with other people unless you pay for your own server. For 3 friends it just seems like more than is required to me. So while WoW guilds do use those, I'd vote for Skype in your case.