Here's a recent article from PC Magazine
The Best Antivirus for 2015 | PCMag.com that said:
What's Best?
Which antivirus should you choose? Webroot SecureAnywhere Antivirus (2015) is the tiniest antivirus around, though its unusual detection technique doesn't jibe with some lab tests. The independent labs uniformly heap praise on Kaspersky Anti-Virus (2015). Bitdefender Antivirus Plus 2015 also gets plenty of love from the labs, and in AutoPilot mode it stays out of your way. We've named these three Editors' Choice for commercial antivirus, but they're not the only products worth consideration. Read the reviews of our top-rated products, then make your own decision.
That being said...... Being rated the top AV Tool is like kids playing King of the Hill as the current King is always about ready to be knocked of by one of many contenders. I personally use Norton Internet Security which was recently updated so it would run under Windows 10. Why do I stick with Norton? Because they are consistently always up at the top of the hill with their protection and I got kind of tired with trying to keep up with whose on top.
Note that the PC Magazine article did have some links to some of the AV rating services. If you're really into wanting to track the "Best of the Best" then visit those sites and read some of their stuff on how they tested and what their results are.