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#11
It's all a matter of opinion.
I base my recommendations off the type of user. If you are the type that steers clear of peer to peer sites, you don't download pirated software, you don't look for hacks and serial numbers and passwords and you don't surf for free porn all day...then I feel that most of the free AV's out there provide a reasonable amount of protection for your surfing habits. MSE, Avast, etc are all fine choices.
If you take more risks (like the above) and you visit questionable websites that offer things for free that shouldn't be free...then you might want a solution with more built in protection like Norton or eset.
If there truly was a best AV product, don't you think that all of us would run it without question?