Now a day's they all offer just about the same benefits. AVG is the big one, but seems to slow everything down just a little, especially if you install and use the browser bar feature. I use a combination of free services that seem to work very well. Down fall is that one free software does small popups every so often in the lower right of my screen. Small trade off for a free service though.
Avira, Malwarebytes, Avast, and CCleaner.
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