@BeSecure, thanks again,

I don’t like Internet Security Systems, or Prime products etc, because I don’t use most of the extra services there. For me: Good habits + Good Antivirus + Windows Firewall… is enough.

I totally love Avast Free, because has less impact on my system (than any other antivirus), and is reasonable good as a plain antivirus. Bitdefender Free is great, but consumes 7 times more RAM than Avast Free. In terms of performance + security, my vote is for Avast Free.
However, I am not sure about exploits and ransomware.

Still confuses me the fact that most of the free antivirus (Avast, Bitdefender etc) argue that “are enough”, but in upgraded software, all of them (including Microsoft) separate modules for anti-exploit or anti-ransomware.
I repeat, is not just Avast. All of them are equal. Bitdefender Free argues that is enough, but in paid version has a separate module for ransomware.

In theory and marketing, all free antivirus seem to be enough against exploits and ransomware.
But, in real life, all paid antivirus have an extra module for ransomware.
I am not really interested in this schizophrenia. But yes, I am interested in knowing the true (extra modules are necessary or are redundant?).

Malwarebytes free anti-exploit and Bitdefender free anti-ransomware, both have very low impact on my system.
I always hated redundancy with Avast Free.
But, considering that is not clear if extra modules are or are not redundant, and considering the low system impact, I believe that I will keep this combo (Avast Free + Malwarebytes Free Anti-Exploit + Bitdefender Free Ransomware).

Thanks again BeSecure!