AVG vs. Avast
There are two major things that keep myself from getting AVG:
System Restore
Boot-time scan
AVG [free] does not have boot-time scanning, or a workaround with System restore.
Avast, however, does.
And it surprises me, you would think that these features would only be for the pro version, but, fortunately, for us, the people down at Avast want happy people.
What benefits are there?
You dont have to loose your System restore data when you find a virus in the System Restore.
When Avast finds a virus in the system restore, it allows you to lock the file, and remove at startup.
If your computer is infected with a virus, and its going too slow to scan (eg: Virus slipped in because you had the scanner disabled) then you can do a boot-time scan, in which it edits your boot.ini (I believe that is the file), and it acts like a DOS scanner that is able to do a quicker scan.
Now I realize that this is a half rant post, but, the truth is there.
And I would hate to start a debate (not really), but, for the sake of all the people who hit the "Google" button for this type of topic, feel free to list other benefits of Avast or AVG.