Penne lisce or penne rigate? Obviously PENNE LISCE. But why?

Penne lisce or penne rigate? Obviously PENNE LISCE. But why?

Italy, the country of food, tradition and culture, with its 23.5Kg of pasta consumption per person, per year, gives us another battle on food. What is the type of Penne Italians prefer? Lisce (smooth) or Rigate (with little grooves on it), and why do they choose one...