Hey everyone, show John some respect.
Defender is not rated horribly as it used to but I will still say many other AV's do out rank it.
From my "up to date reading" on defender it has vastly improved over the years but still shows the strongest results when using *only* M$ products like M$ Edge. When starting to use some 3rd party products on your PC like a browser such as Google Chrome of Firefox you see a bit of decline in the detection.
Personally I recommend ESET as I deployed that some years ago in my enterprise and have not seen a virus get past it yet. A good free AV that provides true active protection is Sophos Home.