Which Gives You More Of Hard-To-Replace Software, PTC Or Fair Isaac?

PTC (PTC) and Fair Isaac are both owned for software that customers find hard to replace. PTC sells more to manufacturers it already serves, while Fair Isaac has raised the price of its mortgage credit score. Fair Isaac stock has lost 46% in a month, while PTC stock has lost 12.5%. Which of the two is gaining the firmer grip on its customers.