I have steel roofing after doing considerable research. The deciding factor was its extensive use in Australia where they experience extreme heat. Yes, they are a bit noisy during rainy season, but the light weight, low maintenance and no breakage more then makes up for it.
I had tiled roofs on several houses in the US and was continually replacing broken tiles. There are three different thicknesses available at most shops and I opted for the thickest. When I did my carport, I opted for the second thickest. Your call in the end, but be sure to take all parameters into consideration.