I would rate Avast free as the best. It gives all the shield thro which virus rootkit or any PUP attack a computer. I always use AVast . The test may take in to account the common items found in Avs. But there are special items , in which I think that Avast surpasses all the AVs.
I had this stops suspicious url , suspicious mails, dangerous sites from attacking the computer. Of course, there may be still bugs in this program, but comparing the free version, i rate Avast as the best. If it contains the internet security or add on to the free program, then this is the best, as per my rateings are concerned. I used all the AVS including mcafee, norton, avg etc etc, but the real protection, other than some sophisticated malwares, this is the best free program.
Hope to get the internet firewall in AVG 2015. I also would like the programmers to include firefox as a default inclusion in Windows Firewall, which will give best browsing experience