What Antivirus do you use?

I have been using Windows Defender and Privatefirewal with K9 Web Protection on my Windows 10 Home Edition since Windows 10 came out, and believe it or not I have never had a problem with compatibility. I'm very savvy and smart when it comes to computers since that's what I do for a living. but this combo is super light and awesome at protecting my laptop, plus I have Hitman Pro Malwarebytes and Zemana Pro for on demand scanning.