Windows AV, at least until the 1607 settles down some more. It's adequate for most purposes anyway, just needs a little security boost here and there. You go first.
I don't use AV anymore currently. In fact I don't use free AV. Majority are pretty packaged with PUP if you're not careful and overlook those ticks. But I do install BD Free Beta on my family's laptop. What I like is the "over-simplicity". No buttons to click; just a slider to enable/disable protection and thats it.
I'm satisfied with Windows Defender + HitmanPro.Alert on one machine and have no plans to change that any time soon.
its the only free av i have ever used and my family too, because of me. i had never problems with it and it safed my family quit often with max settings. if u configure it right u dont need to make anything. it is just there and does the job nice.