Learning about how antivirus works is similar to learning how a car works, so long as it gets the job done; who cares? I recommend using Microsoft “Windows Defender” because they own the operating system and get all the data first. Microsoft openly shares the data with the antivirus software companies, but make no mistake, Microsoft has the data first.
Every time you see some minor Windows 10 update that takes seconds to install on your computer, it could be life-saving code. You have no idea that that Windows security updates are combating viruses. Most people think updates are annoying and relatively unimportant.
I personally have been using Microsoft security exclusively as far back as I can remember. In its original iteration, Microsoft called it “Security Essentials” and changed it to “Windows Defender” in Windows 8 and 10.
It’s Microsoft’s operating system, and you are their customer, and they want you to have an awesome experience. That’s Microsoft’s primary reason for protecting you with free lifetime security.