reckor,
I was unable to locate the site you mention using the link info as stated.
Such a report is speculative at best. It depends on how the AV was tested.
You ask "which is better free and pay" to which I can only say that I have used 6 of the top AV's over the years, and feel very comfortable with Avast. I started with the Home version and also use the PRO.
Avast updates are frequent and the autoupdate function is a pleasure.
It does use a bit more of the computer resources because of the manner in which the scan engine is used, but that is negligible considering the protection it offers.
The only other comparative freeware is AVG which also offers free updates.
AntiVir is another simple to install antivirus and still ifree.
Selecting an antivirus is a matter of choice and personal preference.
The reason I use Avast is that it is still being expanded and perfected.
From time to time a bug will show up which we normally take care of via the forum, or the Avast Team will step in and run a new build update.
In all the time I have been using Avast, I have heard more complaints about other AVs then Avast.
Hope this helps.