UG is widely used in mold industry, but CATIA is rarely seen.
CATIA is used by most OEMs in automobile industry, which leads to CATIA being used by most suppliers.
So it can be said that in the mold industry, if you are proficient in UG, you can basically cope with CATIA.
If you are in the automobile industry, you'd better master CATIA. Of course, UG can also be basically proficient.