I used Kaspersky, Avira, AVG, Malwarebytes and Dr. Web. I found Avira and AVG rather disturbing, to be honest, yet they did their job good enough. We had Avira in one of the offices I worked in, it had its minuses, like not dealing with all the viruses I had on my USB drive but it was about 5 years ago. All of these antiviruses have some free tools, you can try them our first. If I were you, I would go for Malwarebytes or Kaspersky. The last one is installed on my PC for years already and I have no troubles with it so far. Btw, never heard of Emsisoft. Gonna check that out one day.