according with this page, the first impression is that you should never use AVG...
anyway, every company talk about itself as the best one.
http://www.kaspersky.com/comparative_tests?id=207575589
http://www.kaspersky.com/comparative_tests?id=207575591
http://www.kaspersky.com/comparative_tests?id=207575625
http://www.kaspersky.com/comparative_tests?id=207575621
http://www.kaspersky.com/comparative_tests?id=207575622
http://www.kaspersky.com/comparative_tests?id=207575592
http://www.kaspersky.com/comparative_tests?id=207575589
http://www.kaspersky.com/comparative_tests?id=207575597
http://www.kaspersky.com/comparative_tests?id=207575593
http://www.kaspersky.com/comparative_tests?id=207575588

but the most important thing is to hear the user's experience (and the personal experience, of course). Years ago, I was user of the Peter Norton's antivirus, but now I see impossible to live and work with Symantec. Now, I use NOD32 and I'm feel happy and safe with it. Anyway, I think that Kaspersky is also a good altenative, a safe and powerful option.