There is a 3rd alternative...
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Why choose Microsoft Teams or Element?
Both platforms offer a free version, add-ons, roles management, contact management, chat, file sharing, mentions, polls, groups/channels, GIF and emoji, and threads. However, Microsoft Teams offers 1-1 and group video calls, whiteboarding, screen sharing, audio calls, breakout rooms, recording, participant permissions, subtitles and translations, online document editing, documents management, search for messages, people, and files, newsfeed, notes-taking, calendar, task management, "do not disturb" mode, training, help resources, dedicated CSM, and on-premise, while Element does not offer these features. Element, on the other hand, offers voice messages, document viewer, multiple workspaces, and SAML/SSO authentication, which Microsoft Teams does not offer.