This is a hard one because with Hitman, you get two things in one. A scanner (on demand only as far as I know) and an all in one program that can block exploits, etc. ZAM on the other hand has more engines, real time, and behavioral blocking.
If it was Hitman Pro vs ZAM, I'd say ZAM but it's not. Since I only use ZAM for on demand and not real time (as I use SecureAPlus), it's not a negative in HMP's case to not have real time scanning. With that said, I'd have to go with HMP + HMP.A. I can use the features I want from Zemana for free anyway which is on demand scanning. I'm a big fan of Zemana but I always vote and comment in the most unbiased way possible.