Started with Norton many years ago when it came with one of those Cow computers (Gateway). Never, never again. It was a hugely bloated program that slowed down the computer, and it was almost impossible to clean out of the system when we switched anti virus.
Used McAfee for about many years because it was provided by my employer since I had outside access to their server. Worked ok. Got hit by a couple of Trojans or virus. They did a good job of customer support. It did take system resources but not as bad as Norton.
Wife bought a new computer two years ago from Best Buy that came with a year of free Kaspersky for three computers. I switched my computer over when McAfee subscription expired. It is almost invisible. Get the occasional warning message on the Internet. Doesn't seem to us many resources.
Did get hit once by some ugly bug that disabled Kaspersky. Their customer support was amazing. They took control of my computer and worked for almost two hours putting things right. I sat there for about an hour watching what they were doing and where they were going. I go back all the way to Windows 3.0 and couldn't believe how deep the tech dug into the operating system. I did ask a couple of technical questions which were answered.
We spend too much time on the Internet banking, buying and selling and have a website. Just don't to rely of something that is free with no personal tech support.