Hi!
The costs don’t matter at all – if you compare apples to apples. The few extra bricks are peanuts in terms of cost; but of course, windows and blinds cost more than a bare roof surface with tile covering. However, if you compare the costs of dormers and/or roof windows, it looks different.
A two-story house with a hip roof (city villa) looks great, and you can gladly do without sloped ceilings in everyday life. The most important thing, however, is summer heat protection – under a tile roof, I never want to have to sleep again!
And if money – as always – plays a role: build a shed roof! It’s cheaper, more practical (standing height) – but visually a bit more modern.
Oh yes, the appearance spoiled in your planning is not the roof, but the knee wall (Drempel) – such a large area without windows looks like a barn – and interruptions like bay windows or a third gable are even more expensive.
Best regards,
Tomtom.