I have been working with computers since 1983. I have sold them, built them, written software for and networked them. I hated Apple. I considered it overpriced, non-compatible and people who used them were stupid.
Today, between myself and my company, I own 3 iMacs, 2 Mac Pros, two Macbooks, 4 iPads, 4 iPhones, two Mac Minis, and AppleTV.
I discovered that the price/performance difference between Mac and Windows was negligible. I also discovered that software for the Mac is generally MUCH cheaper, especially when it comes to networking and business software. We have no issues with viruses, malware, registry errors, defragmenting, or any of the other maintenance chores that are a part of using Windows in a business. We have had one hardware failure, a shared storage drive, and frankly we were overtaxing it and should have used a server.
So, to your question, what good anti-malware software would I recommend? I really couldn’t tell you, I stopped using that kind of software 6 years ago when I switched to Mac.