I have used both and prefer Kaspersky. With Kaspersky, you can scan third-party software for vulnerabilities and scan your system's settings to be sure they are optimal for security. It let me know that a Windows parser was out of date. It's not a resource hog. One of my favorite features is that it removes annoying banner ads from websites. I have gotten very used to this! You can get a full-featured 30 day trial of Kaspersky Pure (or any other Kaspersky product) from the website to see if you like it.