One of my primary uses for Skype has been phone-calls to family (international landlines) and it has at least been reliable in that regard. Most recently Hangouts no longer works on Firefox (due to Mozilla switching plugin API's), I haven't experience with the other two, which would you recommend if moving from Skype?
I see. I've used them primarily for work, I'm not sure of a service that would cover your bases. I'm sorry that you're stuck with Skype for now!