Good answer Spawn! Thanks.

My OS is Windows 10 Creator (last update).
Due to my work, I am very exposed to virus/malwares etc.
Avast Free Antivirus was my choice after comparing with the major antivirus out here. For me, was the perfect balance between reasonable security and very low system impact.
I kept my Malwarebytes, first because the zero impact in my system, and second because the 180° different method/strategy/focus compared with classical antivirus.

Both, Avast & MWB seem to work perfectly in my system.
I excluded both software in each configuration, in order to avoid conflicts.

However, despite I read a lot, I still can’t distinguish in detail, if there are functions/options/features overlapping in these two software.
Also, I don’t know if I still need another security feature out from these two software.

Regarding the firewall, I also thought about Comodo. I had great experience with it, specially blocking lots of “phone home” etc that Windows Firewall doesn’t block.
However, don’t know exactly why, Comodo firewall is heavy on my system. That’s the reason I asked about firewalls.

I posted my questions in other tech forums, and I am receiving very interesting answers. A nerd guy at MWB forum offered me to write a comparison between Avast & MWB. I will wait for it. I also will keep open my questions here in the Avast Forum, until receive complete answers.

Thank you Spawn