Comparison of Comsol versus Ansys

Hi,

I am doing my master thesis and I need to make comparison of Comsol and Ansys. My master project is focusing on heat transfer interface.
Still I am using the Comsol, because for me it is more enviroment friendly.
However I have one problem.... I need to know some advantages versus Ansys, because I need to prove why I choose the Comsol for further reasearch. Of coure it would be also nice to compare it with regard to heat transfer interfaces
Could you help me with this problem,


Thanks in advance,
Zygimantas