I think Avast is probably better. However, it does go over the top with some things.
For example, it once stated that my patched 'Splinter Cell: Chaos Theory' had a 'hacking tool' inside of it (even though I downloaded the patch from the Splinter Cell offical site).
Since then, I have started to use AVG. It, on the otherhand, doesn't seem quite as protective. But is still more than I need