basically it's whatever works well on your machine & you're comfortable using. Further variation by Paid or Free. Assortment in sticky at top of page. I "think" the more "cutting edge" the AV, the more likely false positives. For Paid I suspect it could be NOD32 for Free I used to go w/ AVG but they're showing many problems still ('tho' they're working on them) so I'm going AVAST! JMHO but to each their own... Happy