I used to use Avast free for years, but eventually got fed up of the crapware they would install without my permission, and of course constant pop ups and nag screens.
So Avast got uninstalled and I paid for Bitdefender, that didn't last long, we soon got fed up with the constant notifications, so that got uninstalled.
So have been using Windows Defender/security ever since, no nags, it just does its job. Only thing I would say is the user interface is a bit of a mess.