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Don't get me wrong, I am no fan of AVG. I tried it a number of years ago and wasn't really happy with the way it worked, and found it slow at scanning.
I think the problem with Norton is that they add so many "features" if you get their internet security pack. Eg phishing filters, transaction security etc.
All these processes have to use some of your system's power.
If you have a basic system, it can really slow it down. If you have a high end system, you have probably bought this for a reason (eg high end gaming etc) and you will be sensitive to things hogging CPU cycles.
The antivirus portion of Norton's probably isn't too bad in itself (I believe it passed the recent VB100). But it's all the extra stuff that they bundle along with it that causes the problem. And most people don't just buy/install the antivirus program - why would they when for an extra couple of dollars you can get all these other features ;)
IMO there are many better choices for paid antiviruses - eg Nod32, Kasperski. But if you are getting Norton's for free and only using the antivirus component that isn't a bad option.
As far as the free ones go, I don't mind Avira Antivir, or Avast. But I still think some of the paid solutions are better.
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