A Web edition database up to 5 GB in size is best for small web applications and workgroup or departmental applications. ...

A Web edition database up to 5 GB in size is best for small web applications and workgroup or departmental applications. A Business edition database up to 150 GB is best for independent software vendors, line-of-business applications, and enterprise applications. Premium edition databases provide reserved capacity for more predictable performance, Active Geo-Replication, and database Restore Service capabilities.