On the Mac, I use MalwareBytes anti-Malware for Mac.
It's free, and it works.
There's no need to use anything "more" or anything else.
Since OS X was first introduced back around 2003, there has never been a "virus" (per se) found "in the wild". A few created and demo'ed in "closed environments", perhaps, but not "free and loose".
There is (of course) Mac malware and adware, and that's what MalwareBytes snags. I found this out myself -- first piece of malware picked up in 30 years, MB identified it and removed it.
MB is a free download.
It will "prompt you" to sign up for the "pay for" version, but you don't have to do that.
Just keep saying "no thanks".
The prompts will end after 30 days and it will "convert itself" into a permanently-free version and can be run that way.