Basically I come from solidworks. I have been use solidworks for 3 years. Its a powerful solid & surface modeling also. The big different is solidworks have a parametric concept like Michael mentioned before. As I know solidworks is the easiest parametric modeling software.
But today my favourite software is MoI ( because the easy to use workflow & of course MoI is very affordable ).
You can open MoI file directly use solidworks. So it will give you a good combination.