Media for Norton vs Zone Alarm firewalls

Norton vs Zone Alarm firewalls

My Zone Alarm Pro firewall subscription expires in a few days and I recently bought a Norton Internet Security 2008 package that contains a firewall. I currently have the Norton firewall turned off and just use the Zone Alarm Pro firewall. I don't use the Win XP firewall because I heard that it's not a good idea to have several firewall on at the same time. We get internet through a Belkin pre-N wireless router that is supposed to have some sort of firewall built in and that one is turned on. My computer connects to the router with an ethernet cable and my son's computer uses a Belkin N usb wireless adapter. They both have the same current setup I describe regarding firewalls. Can anyone please advise on whether the Zone Alarm Pro firewall is any better than the Norton firewall in my situation? Should I renew the Zone Alarm Pro subscription or uninstall it when it expires and turn on the Norton firewall? Thanks for any advice.