Cisco’s DCHP vs standalone DHCP server

We want to deploy dhcp servers to our branches but we came to a issue: use Cisco’s router dhcp server or install a dedicated machine for the task.

Does anyone know about pros and cons of using cisco’s implementation against a dedicated dhcp server?

Each office have between 5-20 users that share a 64k Frame-Relay line to our corporate office with telnet sessions/internet access.

Elliott