The meeting itself
Google Meet
Capacity is genuinely published — 100 to 1000 participants depending on plan, 24-hour meetings, noise cancellation from Standard, in-domain live streaming at Enterprise. But the evidence never mentions a screen share, a breakout room, a mute control or what happens when half my class joins on a weak mobile signal, and anchor five requires exactly those — so I stop just under it.
Zoom
Breakout rooms are documented in real depth — five distinct roles, pre-assignment, broadcast into rooms, help requests, timed close — and capacity is published per plan, from 100 participants up to a 5,000-participant add-on, with webinars at 500 and RTMP live streaming and live transcription in the browser. What holds it back for a class where half the room is on a phone: I found no public information on adaptive quality or behaviour on a weak connection, and none on per-participant moderation, layout control, or diagnostics after a bad call.