Rakic,
You'll need to provide more information on what you are looking for. Catia is dominant in Automotive Body/Chassis, Aerospace, and Ship Building where class-A surfaces are required and much of the detailing is driven from surfaces (sheet structures). Pro/E has a compelling market share in Automotive Powertrain, Defense, Consumer Products, etc. It really depends on what you are going to be doing with it. Other than the issues surrounding Class-A surfaces, there is little to technically distinguish them. It has more to do with marketing and a herd mentality.