I'm about to setup a surveillance system for my brothers shop, and i'd like to know why more or less analog (~520tvl) cameras are still present when we have digital IP systems today. 
Isn't the digital system (IP) with ethernet/wifi superior? I compared 1 MP cameras with normal 600 TVL systems, and the IP based seems to win all rounds. Still, analog systems are still very present. 
  
Regards 
Eikido