I guess it's really true that anyone with a computer ought to have some program in place to protect it from evil-doers sending viruses, spam, trojan horses, keyboard loggers, and all kinds of other bad stuff.
My security program subscription expired recently. I had been using the product for several years so I decided it was time for a change. I spent at least a couple of hours, probably longer, looking at reviews and rankings. The rankings I found varied wildly in their selection of which are the two or three "best" programs - there's Kaspersky, and G-something, Avira, Norton, at least 15 or 20 "security suites," including a couple of free ones. How to decide?
What I eventually discovered was that the difference between the top choice and the #20 choice in most of these rankings is marginal. ALL of them do a pretty good job these days, and the differences often lie more in the interface than in the actual performance. I renewed my "same-old, same-old," and saved myself the time and effort of having to remove one program, install another, and learn its quirks.
Best advice, in my view: If you've got one you like, there's no need to go chasing after "the best" unless you're a serious geek. Otherwise, stick with what you've got and you'll be just as well off.