which 3d software should I seriously learn?

Thanks cameron and cyberdemon.
I will try keyshot hoping to find interesting tutorials
Sorry for this silly question but:
is surface 3d program more for creating concepts and parametric program for prototyping?
Do you think canadian creative agencies use the same tools than the american one?
I have read a topic here, dealing with “the design scene in Canada” but it was more related to R&D.