I bought MB Pro just before they switched to annual subscription so I have it for life and it's the best investment I ever made. It is now a full-blown AV as well as combating all other forms of malware, so it's the only security program I run in background and it's great. Has headed me off from a few dodgy sites over the years.

I also have SAS Pro on the same terms but don't run it in background. I run a scheduled scan weekly which cleans up accumulated unnecessary cookies but never finds anything else, probably because MB Pro is so effective..

I've found SAS does a better job on cookies than MB but have no opinion on how effective it is as a real-time malware blocker. Of course there's no point in running either program's free version in real time as they are purely after the event scanners. But I do believe there's an arguable case for running both scanners from time to time. They only have to catch one nasty to be worth the trouble.

And of course set your default browser to not allow third party cookies. If you run into the odd site that won't function properly that way, access it in another browser and let SAS or CCleaner clean them out from time to time.

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Paul D