There are so many variables when it comes to choosing a product to secure your system with. Mostly it depends on how you use your system though.
I tried a study, utilizing my two teenage nephews, it worked rather well, as both of them, will surf, uncaringly on the internet. I would place a product on their main machine and turn them loose for a week, then run scans to see how the product stood up to their "surfing" habits. Many did not pass the test. Avast just happened to be one, that let many "trojans" onto the system through this trial. So with choosing, as a few mentioned earlier, it would be wise, to test these products for yourself, with your "habits" to conclude which would work best for you.