I would definitely go for glass if you can afford it. I have a
polycarbonate roof and although cheap and easy to fit it could do with
replacing now. However, It has lasted 18 years which I guess aint bad but
glass should last a lifetime.

Aesthetically glass wins hands down in my opinion but I probably won't be
able to replace PC with glass without rebuilding the roof.

Does anyone know of any other alternatives? Maybe a compromise denser,
fully transparent plastic which is manufactured for roofs? Done a bit of
research myself but most of the acrylic or perpex alternatives comes in much
smaller sheets which don't seem designed for roofing

Keith