I like paltalks ability to "chat" so you can include people who do not have mics (or malfunctioning mics)....but the sound quality is horrible and the ads are annoying.
On my system at least Skype has by far the best sound quality and has an easy interface. I know who is talking without looking at the screen (low distortion)

Ventrillo should be the choice since it allows more than 5 people in a room or confrence call. The sound quality varies for me, but that could be the server (I don't know).....however the sound quality blows away pal talk. I have not logged on to the new server yet, but if you can set up multiple rooms like on the previous server so that we can have "private" conversations if need be then I'm all for it.
Thanks for taking the initiative in setting this up