Now, and according to a study by the independent institute AV-TEST, Windows Defender qualifies as the "best antivirus" in the free segment. The other three who received the qualification were F-Secure SAFE 17, Kaspersky Internet Security 19, and Norton Security 22.17: all paid options.
The study had a very simple methodology. AV-TEST spent two months continuously evaluating twenty security products, all with their default configuration. During this time, the teams were at the mercy of a multitude of threats, in which only four reached the highest score. The only one free? Windows Defender
I took this post from https://www.fayerwayer.com/2019/08/windows-defender-mejor-antivirus-gratuito/ and I just put it because I was surprised that they were so much better that windows and better were together ..
Although the truth is that he has been using this service for a long time and I have done quite well, so I would recommend not using more than Windows antivirus.