I can't compare to others...but I use what's app when I travel.
It seems every country where SMS is expensive (or not unlimited) users prefer what's app.
I like it.
One problem/setback is that it is device specific...but you can install it on as many as you like. You can run it on a pc using blue stacks? emulator. (edit: there might be a pc version now...now sure how you tie it to a phone or device....my experience is that it binds to the phone number but who knows...maybe just "contacts")
first year is free...dollar per year after that.
http://www.whatsapp.com/
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