There is a 3rd alternative...
Atolia, the one and only workspace your team needs
Atolia is a power-packed all-in-one digital workplace: Chat, Video calls, Tasks & Projects, Calendars, Documents, Notes...
Accelerate your team's collaboration game.
Implement it in minutes and save money. Atolia is cheaper than most of the business instant messaging apps.
Why choose Flock or Lark?
Lark is a more premium option with a higher entry-level price of $12/user/month, but it provides more advanced features such as group video calls for up to 500 participants, recording, participant permissions, and online document editing. It also has dedicated customer service, a user profile, and a larger storage capacity of up to 1TB. However, Lark does not offer a free trial, has limited graphic personalization, and lacks some basic features such as a "Do Not Disturb" mode.