Organizations switch to Teams for Office 365 integration, better security/compliance features, and enterprise-grade administration. Included with many Microsoft subscriptions.

Teams needing enterprise features switch to Slack. Gain: compliance, SSO, admin controls. Trade-off: expensive, 90-day message limit on free.

Users concerned about privacy switch to Telegram for better encryption, self-destructing messages, and more privacy controls. Also has large group support and channel features.

Gamers wanting more organization switch to Guilded. Gain: calendars, forums, better group tools. Trade-off: smaller community, less adoption.

Users wanting low latency voice switch to TeamSpeak. Gain: best voice quality, self-hosting. Trade-off: dated UI, no modern features.