The first link has a direct comparison between Norton and McAfee. And daydo is full of it. I myself have done many test and have never seen results like he/she have posted. I have found that most of the better known AV are basically about the same. They will all find and protect your system of known viruses. If you happen to download an unknown virus then you will get infected. All of the major AV company's share info on new viruses and definitions/patches. Any way it is a matter of personal preference in what you wish to use McAfee is rated slightly higher than Norton but it also uses more resources than Norton. Both are good AV and will protect you.
http://www.consumersearch.com/www/so...are/index.html http://antivirus.about.com/od/antivirussoftwarereviews/