ZoneAlarm AV or Symantec Corporate Edition 10

If you had the choice between the two, or a free antivirus like AntiVir or AVG, which would be the best choice?

I've been running on the ZA AV, and I haven't really noticed it doing anything. I tend to get worried when I surf high risk sites, and I don't get any warnings about the things that are dling in my temp folder in the background. So, would any of these four options be better? Or should I just stick with the AV in the ZA suite?

 

Symantec in my opinion would be the best choice out of the ones you mentioned

 

Um, which has better real time protection?

And which uses less resources?

I just installed Symantec, and I see my cpu usage skyrocketing.