What is more accurate HFSS or CST?

Could anybody tell me which software is more accurate for design please?
I used to HFSS. But i heard somebody else said CST is more speedy and accurate.

It is speedy, but i am also wondering whether it is accurate

Guys, don't hit the nerve again. This Q has been discussed down here. Just use the search function of the forum and you'll bump it head on.
cheng