Does 32bit or 64bit security application matters?

[A.S.K]

We can see two different versions of antivirus and firewalls i.e. 32bit and 64bit does it really matters when it comes to security ? pros and cons please.

 

[XhenEd]

From what I know, 64-bit security applications (in a 64-bit Windows OS) do not have as many protections enabled as 32-bit's because of OS' PatchGuard, which prevents tampering of the kernel.

Pros and cons, then, also depend on whether you trust PatchGuard, because it basically handles things that your security product cannot, that is, preventing the kernel from being tampered.

 

[Ink]

In terms of security @XhenEd explains it well.

On the other hand, it's a pain.

HTG: Why Are Most Programs Still 32-bit on a 64-bit Version of Windows?
Microsoft: https://support.microsoft.com/en-gb/help/15056/windows-7-32-64-bit-faq
Gizmo's: http://www.techsupportalert.com/content/32-bit-and-64-bit-explained.html
Other: 32-bit vs 64-bit - Your Questions Answered : Akai Professional - Iconic music production gear, including the legendary MPC

Ubuntu will soon stop supporting the 32-bit OS release
End of an era: Linux distributions will soon stop supporting 32-bit PCs
Installation Media and supportability of i386 in 18.04 LTS Re: Ubuntu Desktop on i386

But Microsoft will continue to support 32-bit, and here is why! (They only care for the majority ($$$) but not the minority)
Microsoft Explains Why Windows 10 32-Bit Is Still Needed


Both 32-bit and 64-bit applications can be installed on an 64-bit OS, but not the other way around.