Try FaceTiming someone with a 3-5mbps connection (wifi or cellular), even if just audio, and see how frustrating it can be. Packets of voice stopping and then suddenly reappearing in acceleration, and generally, very very poor quality. Say what you want, but Skype has been my default over FaceTime for all my calls with my family who have Macs or iPhones. At least, if the quality degrades, you still see pixelated images and sounds remain audible, while FaceTime will constantly freeze unless you have perfect gigabyte connections on both ends. And at least with Skype, you can turn video on and off, while FaceTime will not let you remove video once you started it.
Glad that Skype offers simpler, clearer options again for my aging parents.
FaceTime pauses the video, and keeps the audio, if the bandwidth is not sufficient. Are you sure you're talking about FaceTime?
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Skype has been a dumpster fire since eBay purchased it, and it's only gotten worse under Microsoft.
The recent update is a big improvement. Try it.