Skype vs Squadcast

Hi, I am helping teachers in my kid's schools to set up distance learning and wanted to see what is better between Webex, Zoom, and Skype (although only putting this one in as most parents probably have it). The children are 8-9, so they won't be using it on their own and the parents have no experience using Webex or Zoom.

The main use will be for the teacher to explain what they will be covering in the week and enable some social interaction between the kids.

I need to be easy to use for about 20-25 people.

Thanks for your advice, Lisa

I'm currently on PagerDuty, but I'm about to add enough users to go out of the starter tier, which will dramatically increase my license cost. PagerDuty is, in my experience, quite clunky, and I'm looking for alternatives. Squadcast is one I've found, and another is xMatters. Between the three, I'm currently leaning towards xMatters, but I'd like to know what people suggest.