what is the difference between HFSS and CTS micrwave studio?

HFSS is a FINITE ELEMENT simulator,the run time is very long.
very exact.
drawing the models needs exact [x,y,z] and [Δx Δy Δz]
coax feed of a microstrip patch is very hard using HFSS

i have heard that for antenna simulation, in europe MWStudio is preffered