Again I have never personally used Zemana as I am satisifed with Malwarebytes. We also have members who use Zemana AntiMalware Pro instead of Malwarebytes Anti-Malware.
I have never personally used Bitdefender as I have been satisfied with EAM which uses the Bitdefender engine along with its own technology. Some of our members use is a good product and I do not have anything negative to say about it.