Which one should I learn CATIA or Inventor?
I have learned SolidWorks all by myself from Video Tutorials and willing to learn another software, I do have VTN tutorials of Inventor and CATIA but can't decide which one i should learn and why?
it depends on your goal. if you are looking to work in the automobile industry then I would recommend you to try CATIA or NX if you have access to anyone of those two.
Also, you should look for people in the industry in your area and asked them which software they are using. then you will get the clear picture.
Inventor is very similar to SW, only has somewhat different command names for the same things as SW has. You can do the same things in Inventor as in SW, so, if you want to learn something different, I think that Catia would provide a wider spectrum of things you can do in the program. The decision has to be yours.