We have a Dorema porch awning with alloy frame. The latter is IMHO unsatisfactory for 3 reasons
-the 'quick' system is not intuitive to assemble, as the frame sections are not symmetrical - but this may be just for the porch versions.
-as the alloy loses its newness, its gets a bit'gritty' where you have to slide the joints to tension the awning. This makes it hard work
-the plastic clamps are not fixed to one pole. This means they sometimes come off with wrong bit when you take them apart, or its not postioned correctly when you tighten it up.
Our full awning by contrast, although another make, has the fibre glass type frame, and is very easy to live with. Personally I would avoid the alloy frame.