All Anti-Virus products have their good and bad points.
Just realistically depends on what you do most often for what you should get... not to mention personal preferences.
Over the years I've tried a huge number of them.
Dr. Solomons
Norton Anti-Virus
McAffee
AVG
NOD32/64
PC-Cillin
Live OneCare
Demonsia
Bug Blast
Still the one I've found that seems to offer the best balance between performance, protection and security is definately Live OneCare. If you just go by reviews, then aparently it's the worst... if you go by what people say stuff like NOD and AVG are best.
With the exception of Dr Solomons (which no longer supports Windows, only Mac now), I've yet to come across an AV product that not only make me feel secure enough to click any website or e-mail knowing that anything nasty will be instantly caught and either quarentiened or destroyed; but also barely affects system performance.
The sheer fact that the anti-spyware/malware aspect is part'n'parcel is built-in and works along side the AV aspect rather than the majority of the other products where it is a seperate package and can often lead to both thinking the other is a virus is quite a nice bonus that OneCare doesn't.
Combine that with the daily, not weekly/bi-weekly/monthly database updates. It's honestly not that difficult to see why it is so damn good.
Sorry I didn't write a single line one it just rocking or sucking; but ya know you can't make an informed decision without that little thing called information. You should still goto each website of possible AV products and read about them mind. Make you're own damn decision.