The glass roof also has mounting fixtures for a roof rack. The aluminum roof does not. In Norway it is recomended by Porsche to go for the glass roof option because of the mounting fixtures.
That is incorrect. Turbo and Turbo S has identical engines both front and rear. However the Turbo S has an 600 amp inverter for the front engine compared to the Turbo that has a 300 amp inverter. Hence they have the same HP rating when out of boost mode, but the Turbo S has 200 Nm more torque...