for 13.56MHz RFID system， what is better? MWS (CST) or HFSS

Hello
I'm working mainly on RFID system at 13.56Mhz. I'have to choose beetween MWS de CST or HFSS from ANSOFT. For this specific application what is the best simulator ?
Thanks a lot for your opinions
Regards
PCl

Hi zorg
I think CST and HFSS aren't suitable for that purpose. however CST2006 is better