The built in Antivirus/Firewall is very good, and don’t think you have to worry about aftermarket stuff.
FWIW- I use Zone Alarm, as I had two years paid prior to the SIM install last year. Every time their is a patch, I have to Uninstall it because it blocks the base package file from downloading from the store. Have worked with them for months and nothing they do fixes it. To keep as customer, they provided an additional two years free, so I keep it on my system mostly until patch day and then take it off, get the Sim updated and test making sure it runs, then reinstall it back onto PC. Other than that I have no real reason to have aftermarket stuff since the built in stuff works well enough.