Atlassian Cloud is the right solution if your company wants to provide all teams with constant access to the latest version, but wants to keep the administrative effort as low as possible. With Atlassian Cloud, you can focus on using the applications while Atlassian hosts and operates the systems. You don't have to worry about updates either, they are automated and take place without downtime.
Data Center is the right option for your company if your processes are business-critical. To find out how important high availability is for you, you should determine how many teams will be affected if your system crashes. Maximum performance with high-availability systems is guaranteed with Data Center through load balancing and optional extensions of parallel-connected servers.
Data Center is also the right solution if your company has an increased need for compliance and security. Data Center gives you maximum control by allowing you to integrate all applications in your own environment and manage all security measures independently.