What I wonder about the different orders, is how a young man would find out about them. Most if not all the priests in my area don’t belong to an order - I think the term is “diocesan priests”?
The only theory I have right now, is that “the system” is what keeps the orders going. That is, if the nearest seminary is run by the Dominicans, then it will draw the candidates from that area. If the local Catholic high school is run by Jesuits, they will steer their boys toward a Jesuit seminary. If there is more to it than that, I’d like to understand.
We have no seminaries in this state, as I understand it the diocese sends its candidates all the way to the Midwest for education.