Malwarebytes Anti-Malware this not internet security solution
Anti-virus software Malwarebytes Anti-Malware is designed to quickly scan your system in search of different types of malware and treatment of the most difficult infections
There is no best Antivirus or Internet Security. It's down to the user and their preferences, also take note while product X can protect user A, it may not protect user B.
Performance may vary for different systems, newer hardware can handle software better with at least 4GB of RAM.
Haven't tried many of them but ESET and BullGuard for me. These two worked like a charm on my PC. Very light and effective.
Webroot is great also (very light) but they still have to convince me in detection, removal and protection.I have to test it more.
Using it for the past 7 days, so far so good.
Still waiting for the final versions of BullGuard and ESET 7.