I do recommend folks stop with the brand loyalty nonsense (“Norton rulez!” or “McAfee is best!”) and if you insist on an AV package get one that causes the least damage to performance. However, since this has been true forever (each AV still gets infected) and no two people are exactly alike, I will conclude that no AV is that great. I get customer infected computers with every single Antivirus installed, so anecdotally I see no reason to trust one over the other though admittedly there are larger variables in play from customer to customer, like their particular browsing habits. IMHO, no Antivirus are better than any other so you might as well use a free one if you must use one at all.
