Bitdefender
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More hassle than it's worth for free, let alone for money
I have had bitdefender installed for months, because as far as I can tell it is one of the best anti-malware programs out there (as you'll see this is a low bar). In the time I have had it installed admittedly I have not once tried to install or run malware so I cannot speak personally to its effectiveness at preventing it, from what I've seen it's a good coin flip, however it believes I have run malware on at least 10 separate occasions, some of which being my own scripts, some of which being any random cache it can find on my system. The rate of false positives has made it a frequent inconvenience to deal with the program and it is anything but effortless to get things back to normal after a false detection. Maybe if it had saved me from an infostealer or ransomware it would be worth the time I've spent babysitting it, but I find it hard to figure out who this is designed for when users who understand how malware works will seldom need it, and users who don't will be forced to trust it when it deletes something they were using. I cannot recommend it to be installed on a computer you actively use for more than basic and or business related activities.