I use the phone and Zoom with different chavrusos and Zoom is definitely easier to communicate with. Besides for the obvious reason that you can see the other guy, the audio is a lot clearer. It seems audio in general works better over the internet than a standard phone line be because Google Voice is also very clear.
So kids would definitely learn better if using video conferences, but if someone doesn’t want his kids using technology it’s probably not worth it, because once kids get used to it they will probably be more attracted to it after this is all over.