I've used Skype and gtalk. But not satisfied with them. Now I'm using ibibo and liked it for its all good quality (voice and video quality). It has also other features which I liked also. But to win free prize it is good for Indians. As ibibo not giving prizes to other countries.
Definitely Skype. It's a no match. The more popular is the best because almost everyone already has it
Well,if we compare Google Talk and Skype,Skype is better than Google talk in all reasons-API,colors,quality and ofcourse the calling feature
I`m using Skype because all my friends are using it, If I were to switch to Google Talk I wouldn`t have anyone to talk to
for now Google Talk because i never got a chance to use skype for telephone calls... when when we need to call internationally then i do prefer the skype than the normal phones... skype has the good quailty and low prices to make voIP calls.