Solidworks is compatible with Windows only, whereas CATIA works on Windows and Unix.
Solidworks is designed particularly for 3D solid objects modeling, whereas CATIA is an all-arounder.
The analogy of a manual transmission versus an automatic transmission is very appropriate here I think. The main differences between Solidworks vs Catia are: Solidworks is easier to learn and more suitable for beginners, whereas CATIA is better for experienced users. This gives you a deeper understanding of what's is happening in the model, which is applicable to every package you could come across, but also makes you more disciplined in how you approach modelling and building robust parts and assemblies. Personally, I think it's worthwhile learning on a package that offers the complexity and detail of Catia or Creo. Which is a double-edged sword, as they can be less tedious to use and less frustrating perhaps as you're coming to terms with modelling as a beginner, but at the same time they don't give you the degree of control you would have in Catia or Creo/ProE. In my mind, Inventor and Solidworks are very similar in terms of how difficult they are to use. When it comes to features, SolidWorks has a wider range of. There is a difference here in accessibility though. Both Catia and SolidWorks reach the highest of precision and are ideal for engineering purposes. CATIA is much easier to work with than SOLIDWORKS, models come to life in fewer steps and designing complex geometries is more practical and takes less time. The basic principles and good practices for parametric modelling can be learned with any package and transferred to others.
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