There's no easy definitive comparisons between Norton and McAfee, nor between any others, except reviews, which often come to different conclusions, and personal opinions that are always different, so my own advice would be to go with what you are most comfortable with.
For example I have ZoneAlarm and have used it for years. It may not be a favorite, but I know it and am happy with it.
One thing about Norton, and if I remember rightly, with McAfee. Norton in particular has it's own System Protection component which may turn of the Windows System Restore feature. With your knowledge of Norton I apologise if you knew that already.
Might not have been a bad thing with XP and below, but Windows 7s System Restore is a lot better than for the older versions and is now very useful. You may want to consider turning the Norton security feature off if you decide on that. I wish i could remember if McAfee has this as well.
I just purchased a Dell XPS 15 and the system came with a watered down version of Mcafee Security center. I have always been a Norton AV user. My PC died in 2007 and when I moved in with my girlfriend we shared her desktop running XP. In 2010 I upgraded her AV to Norton 360v5 and have had no issues. Her system was already a slow running system so I never noticed any performance difference in the upgrade. I now have my own laptop with Win 7 and a 2.4Ghz Dual Core processor with 8Gb RAM. I also know that some AV programs can hog the system and slow it down, but I am now more concerned with security than slowing downand they system since I will be setting up a wireless network. I need to know if I should try and upgrade the Mcafee, switch to Norton 360v5, or is there really a better option than either of them. I will be going live with the network in 2 days. If I don't get any advice by them I'm going with my gut and Norton 360v5. I am not opposed to removing that latter for a better option if one is reccomended, and someone can provide me with a way of completely removing Norton's footprint from my Win 7 registry.