CST or HFSS?

which one is better to use in order to simulate field distribution inside an enclosure (or car)? What about EM field-human interaction?

CST is best for such kind of problems and this is also very fast .............

ravi8331, could you tell me why you think CST is better for such applications?

I think this is a though question to answer since there are so many parameters that influence on the solution accuracy vs time.