No,I have never used Mafia but have rich experience with hf$$ series.However I have used MWS which based on Mafia technique core.In my opinion, MWS is easier to use than HF$$,but HF$$ is very powerful for one who have strong theory background because it is very versatility.
I guess you should choose a simulator according to the type/shape of the input coupler. The feasiblity(whether a particular software is useful)/speed/accuracy etc. all depend on that.