The meeting itself
Google Meet
Capacity is published per plan — 100 to 1,000 participants, 24-hour meetings, in-domain streaming and a hardware add-on — but the evidence says nothing about screen sharing, breakout rooms, host moderation, waiting rooms, or behaviour on a bad connection. I cannot credit meeting controls I cannot read, so this sits between the low-limit and most-teams anchors.
Zoom
Breakout rooms are documented in real depth — five distinct roles, preassignment, timers, broadcast, help requests — and capacities are published per tier, from 100 and 300 participants up to an add-on reaching 5,000, with webinars at 500. Waiting rooms, passcodes and authenticated-only joining are enforced, with a waiting room switched on automatically when nothing else is set. We found no public information on adaptive bitrate, on what the call does on a constrained connection beyond a stated requirement of quality network connections for 1080p, or on diagnostics an admin could read after a bad call.