Which is the best extention while saving a model in Catia?
There are many extentions and out of many extensions which is the best extention that I can save that model. An extention that most cad softwares support
i supposed in native extention, for second option maybe use STL, some softwares works better with them, igs sometimes import cut faces. you can try with both.
step and iges are good extension files use that