As I'm on a laptop, I preserve power as much as possible. The consequence of that is, I don't use reactive products (favoring instead proactive) that scan files - - over and over and over again. If the proactive approach is truly effective, the programs don't get infected and thus don't need to be scanned.
So I favor Avast! Free as it proactively scans email and every weblink I click to see that infections do not enter the system.
I'm still on the hook for avoiding email phishing attempts, but that's a matter of knowing your correspondents and avoiding emotionally charged email subjects - - click delete and SMILE.
I've used this technique for years without any infections occurring.