If a WiFi network is required to cover just a small distance such as a single floor home or open plan office, a stand alone Access Point could suffice. But beyond this, for larger deployments and distances, it makes more sense to go for a Wireless Managed System, this is because the management of Access Points can be made easier through a separate WiFi WLAN controller and from a central point.
Imagine a huge office or school with hundreds of Access Points. If a new user joins, new policies are introduced or a new upgrade is released for the AP and it's very difficult to update each AP individually. With WiFi Managed Access Points and a WiFi WLAN Controller you can roll out multiple policies, updates, and perform a lot more functions that are critical for maintaining a WiFi network and enabling applications in it with ease.
The UniFi® Enterprise System delivers a breakthrough combination of performance, reliability, and scalability with top performance/price value. Intuitive management software featuring a graphical user interface is bundled with the UniFi hardware at no extra cost – no licensing fees or support costs.
easy-to-use yet feature-rich solution for creating highly scalable, end-to-end systems of network devices. Using a single, intuitive interface, the UniFi Controller software conducts device discovery, provisioning, and management of UniFi devices* spanning multiple locations.