Is it better to engage in elevator industry or valve industry?

To the elevator industry! In the past, the valve industry was fine, but now valve manufacturers are everywhere, especially small private enterprises represented by Wenzhou, which produce many kinds and sell by the catty. Now the competition in the valve industry is fierce. The market share is reduced and basically saturated. Elevator industry? I don't quite understand. Where there is real estate, there is a market, and the prospects are good.