Apple Mail is free and capable, so third-party email clients compete on unified inboxes, snoozing, send later, templates, team features and encryption. Some process your mail through their own servers to power these features, which is worth checking before you add a work account.
Spark is a popular client with paid team features, Thunderbird is Mozilla's free, open source client with built-in OpenPGP, and Mailspring is open source with a paid Pro tier. Airmail and Canary Mail are Mac-focused alternatives, and Tutanota offers an encrypted mail service with its own desktop app. Check how each handles Gmail and Exchange accounts.