What are the major differences between CATIA and NX-CAD and PRO

 What are the major differences between CATIA and NX-CAD and PRO.

 CATIA is a software of the company called Dassault System which basically is an Aviation company.  Catia is a 3D Parametric CAD software which is mainly used in aviation and automobile sectors.  Every CAD softwares have some strong points.  In Catia The Surface Modeling part is advanced than other softwares where as PRO/E (Now known as Creo) is a 3D parametric software of the California based company called PTC (Parametric Technology Corporation).  The best part of CREO is mechanism portion.  Mechanism part in CREO is the best feature in CREO.  Its easy and simple to use.  NX is now known as Unigraphics is the cad software of the company Siemens its an advanced 3d CAD software with lots of advanced features.  One of them is synchronous modeling.