CATIA is probably the most preferred 3D modeling tool in the automotive and aerospace industries. This specific surface (it can be handled well by the experienced users) is well suited to use parametric design principles and hence result in great products. One of the issues we have in the automotive industry is to work with large surfaces for body exterior (main body, gate, hood.) or interior trim (door, headliner.) panels. CATIA enable us to design surface perfectly through the lines. Also, assembly features for intricate designs (gearbox, exhaust, engine, suspension.) are more than adequate. I did not find any inefficiency while designing products with CATIA. Only the interface and handling of the menu and mouse is not the best - or at least you need time to get used to it.
I see FreeCad as the perfect solution for a startup with limited resources that want to save as much as possible and doesn't mind using non-standard 3D CAD software, i.e., it's not required by customers to use specific software for compatibility. It's perfect for hobbyist use and makers who don't care about brands and pay monthly fees. I see it as very well suited for small businesses that need FEA (finite element analysis) and can't/don't want to pay huge amounts of money for it, just like us. I see FreeCad as less appropriate for big corporations or well-established businesses that need standardized solutions, compatibility with clients or good version management. Don't get me wrong, it can get the job done, but it will be much slower than state-of-the-art CAD systems.
Usability is awkward. Perhaps if you learn it as your first CAD, it will feel OK. Still, it comes from commercial CAD products like mine (Onshape, Solid Works, Inventor, Solid Edge). You will feel it is less intuitive, with a less polished UI, difficult to customize and, this is a subjective one, less serious. I'd love to see it improve the usability and UI. I believe the engine behind it is powerful, but how you interact with the software is still lacking.
I generally contact with IT or internal CATIA support team, so I cannot comment in detail. I remember we have struggled to move to v6 update, and it required a long and detailed work to update all the systems. There were some times we had limited support from Dassault, but it is normal for a company of our size. So I cannot criticize much.
Once major advantage I realized when using CATIA is surface modelling, and modifications or changes in part model later. SOLIDWORKS provide a really good and quick way to part modelling. However, part modifications and assembly modifications take time. In CATIA, complex geometries can be easily generated, when compared to SOLIDWORKS. Managing and updating designs of large scale models and complex geometries made me realize an advantage of CATIA over other CAD software.
Freecad is used often when receiving files from multiple sources and the need to work with cad in various forms from meshes to solid cad. Often when receiving scans of 3d objects the format is easy to work with and convert to traditional cad later on. There is no other cad that can bridge the gap between all the cad formats that we found yet.
The ease of modeling helps a lot to save time, in both modeling new parts and also assemblies, which in the end makes a great positive impact on the development.
