Well its a complex answer basically everything you should do should be like an oinion. Looks of annoying layers to stop someone breaching your security. As many people have said safe surfing and safe practices are the best way and scanning emails that you are suspect. Dpends what you need secured they both are pretty good and very much of a muchness and in my opinion personally I would use emsisoft. Purely because of privacy concerns and how they handle your data.
If you have a look at their data handling policy and user agreement they seem to word it more favourably towards the end user. I personally am switching to them from bitdefender and avast for my systems at home.
Remember Strong passwords, Various email I.D's and two stage verfication for anything that is important in your emails. Also encryption if you have sensitive folders on your computer. Also a dedicated anti malware tool and software like Emsisoft or Kaspersky not both just one or the other. Also stengthen router password.
Hope this helps.