Best free antivirus?

The context in this post is purely based on my limited knowledge, I am not comparing myself to security experts, but I am judging antivirus softwares using freely available data that I am aware of. 

The technical comparison among free antivirus softwares almost does not exist, because antivirus vendors normally send their premium (read: paid) versions for tests. So far, only avast did the otherwise (see AV-Comparatives). 

Many vendors actually release both free and premium versions, I am not sure whether this will completely change the test results or not, but if you read the results, even the paid versions could not guarantee 100% detection.

Personally, I prefer two free antivirus softwares: Panda Cloud Antivirus and avast! Free Antivirus. I really like the idea of cloud computing and simplicity of Panda Cloud, but I switched to avast because Panda Cloud required manual program upgrade (they remedied this problem in version 1.3). (I had used older versions of AVG and Avira, but false positives/missed detection/nagging upgrade offers had turned me away, and I am reluctant to give them a try again.)

I give avast applause for their bravery.

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