One of the main advantages is the cost of connection to communication channels and traffic. Usually, the cost of traffic on the site of the Internet provider is many times, and sometimes tens (hundreds) times less than the cost of the services of providers in office centers. You get a high speed of server connection to the Internet at the lowest prices.
With the colocation service, you receive highly reliable services to provide power in the data center. Usually, data centers have power supply via two independent feeders, they have powerful backup power systems. In reliable data centers, diesel generators are used in the event of an emergency power failure.
You own the equipment yourself. If your server lacks disk space, RAM, you can just upgrade to the server.
You own the software installed on your hardware. You do not need to ask the hosting provider to install the software you want to use. You choose and install the software that you need.
If your office moves, then the server continues to work. If necessary, you can transfer your server to another data center using the services of another provider.
The colocation service provides greater security for your equipment, because the Internet provider accepts the equipment for responsible storage and is responsible for its safety.
Most Internet providers offer additional services for server maintenance or configuration, which allows you to save on hiring permanent IT professionals.