Feel free to run whatever you want on your computer, its yours. But I contend that antivirus and antimalware is relatively useless in 2016.
Im not saying you should be unprotected but paying twice for double protection that doesnt really work that well against modern threats seems unwise to me. Not to mention the performance hit to your pc.
Here is avast and malwarebytes in action together. Please watch the whole thing. At around 14min into it they start scanning with mbam and avast free.
https://www.youtube.com/watch?v=yVsUQ5cMo94
Its all about knowing what not to click on. Advanced malware can evade the current common antimalware/antivirus.
also..A virus is a kind of malware. So since most antivirus programs also say they protect against worms trojans etc., how is an "Anti-virus" different from an "Anti-malware"?
answer: its not, its a marketing term. and a way to get you to run both. MBAM knows people stubbornly like their Antivirus so they say, hey we arent an antivirus we are an ANTI-MALWARE you can run both. And you can, but you are running the same thing x2. its marketing.
http://lifehacker.com/the-difference-between-antivirus-and-anti-malware-and-1176942277
avast says they are an anti-malware.
from the link this is avast's statement when asked if they are an anti-malware:
Avast scans for and protects customers from all varieties of malware. Viruses were extremely “popular” in the ‘90s, which is when the term “Antivirus” became common, but today viruses are the minority when it comes to malware. There are, however, a few at-large viruses currently evolving and spreading, these include “Sality” and “Virut”. More common than viruses is malware like Trojans, Worms, Backdoors, Exploits, Adware, and PUP (Potentially Unwanted Programs), which can include communication clients, remote desktops and password revealers, just to name a few.
The focus of online criminals has shifted and therefore malware has changed. Criminals see today’s online society as an opportunity to steal personal data including credit card and banking details, pins and passwords, and information such as home addresses, phone numbers and even the names of family members. Criminals can, for example, write malicious code and distribute it in the form of a trojan. The trojan can collect personal data which can be sold to crime organizations who can then steal money directly from the victims bank account.
Avast’s immense user base consists of more than 184 million people worldwide, each of whom is connected to the Avast cloud, this allows each file execution to be analyzed online. As soon as malware is detected within the user base a close to real time update is sent to all users, providing almost immediate protection against all the newest malware.