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What materials are appropriate for patio roofing?

We have been living in the house for 3.5 years and are currently considering covering the patio.

The coverage area is about 26 square meters. It is 7.30 m wide and 4.00 m deep. A special feature is that part of the terrace is sloped, so that the depth on the left side is not 4.00 m, but 2.00 m. This means that part of the roof is sloped. This means that part of the roof and the drainage must be sloped and this must be adapted on site, we cannot use a roof with an offset x by y meters from the peg.

What we originally wanted and what we were offered:

— Powder-coated aluminum construction.

— VSG 10 mm cover glass

— LED lights in the rafters

— Shading under the roof with radio sensor

— Both sides (left 2.00 m deep and right 4.00 m deep) can be closed with frameless glass sliding doors

The cost of the room is $19,000. Shading adapted to the sloping surface also costs even more. The affordable under-roof option would not shade a sloped area of about 3 square meters.

What the second company suggested:

— Powder-coated aluminum construction.

— Polycarbonate polycarbonate multi-wall roofing sheets in milky white * (This company specializes in their production. It is claimed that this coating has many advantages. The 2x UV filters protect from the sun, while the integrated, prismatic structure is designed to collect the sun's rays in bunches and cast them down, so that the light loss is only 7%. It is claimed that no shading is required. The climate is said to always be as if you were sitting in the shade. The polycarbonate is supposed to be self-cleaning. Now I'm primarily skeptical)

The 2x UV filters protect from the sun, while the integrated prismatic structure is designed to collect the sun's rays in bunches and cast them down, so that the light loss is only 7%. It is claimed that no shading is required. The climate is said to always be as if you were sitting in the shade. We are talking "only" $8,000 here.

Sure, I'd rather pay a cheaper price, but I can't believe all the benefits, especially the fact that there is no need for shading. Do you have any experience? The main argument against layered sheets is the noise they make when it rains. But that plays no role in our house, so the argument is not applicable.

How have you solved this problem? What combination of materials would you recommend? 

• patio roof