Which Firewall is Best?

This is kind of a personal opinion question but I am at a stand still on which one to use. I am a Norton Utilities user and can’t do without it. I purchased a McAfee Firewall and found it is not capatible with Norton so I decided that I should purchase the much more expensive Norton Personal Firewall. After reading reviews I found that most people suggest using Zone Alarm Firewall instead. My understanding is that free software is easier to hack because people can get it and tear it apart more easily. Which firewall is best for me to be using?

Sorry the points aren’t much, but I want to be able to give everyone some for their opinion. Thanks. Sherry