I have tried most of the AVs out there because I write review on articles and get to fool with a lot of them. I like the Emsisoft Internet Security, it updates 24 times a day and is pretty easy on the resources. Webroot, might be the fastest scanner with the smallest footprint I have ever used. When it comes to the big guys Norton, Kasperskey, and Bitdefender, I think they are good but resource hungry. An antivirus program has to be easy to use almost invisible until needed and when something continually slows you down I worry about the possibility of individuals bypassing it to speed up their system. Final two things, Windows Defender in Windows 10 is on its way to being a major player, it has finally passed a better than 90% catch rate and I believe that each new release of Win 10 will improve its effectiveness.
I know this was about Antivirus but seriously, if you want to stay safe, people should be thinking about running everything Sandboxed. You can't get infected if its not on your machine. Thanks for letting me give my two cents.
Jim