I have seen that review and all I can say is that the signatures for MBAM were more updated to the new malware that was used in the test. MBAM, from my experience, stays on top of things even better than any of the AV providers and is better at removing stuff that does get in than any of them. Avast! seems to update it’s signatures once a day, MBAM does it a lot more frequently.
No anti virus application is 100% effective as today’s malware writers are very prolific because they want $$$ and Internet crime is hard to prosecute.
So a Layered Defence approach to system security is needed just like deadbolts are good on entry doors to your house.
I use the following as well as making sure that the operating system is up to date:
anti virus: avast and Microsoft Security Essentials
anti malware: Malwarebytes’ Anti-Malware (MBAM) Pro