Closed Circuit TeleVision (CCTV)
You get Network (IP) Cameras and Analog Cameras
The question is, what type of system will be your choice. See the following comparison discussion.

For starters, with IP cameras you will receive better video quality. For facial recognition, the Crime Scene Investigation (CSI) effect.
With IP you do have scalable option opposed to the Analog system with the limited channels of the DVR.
You can take your IP and arm it with additional hardware such as with Ethernet switches and have many more cameras than with your traditional analog system.
Being able to use a simple CAT5 wire on IP systems makes things a lot easier and less expensive when it comes to wiring.
With IP it makes off-site storage capabilities and retrain multi-revenue a whole other option.
The opportunity to integrate with your home automation systems and touch screens, you certainly got a lot of opportunities when it comes to IP.
On the Analog side, obviously it is less expensive, however with the channel vision that IP is offering, you will find that the excuse of IP expense is no longer valid.