Advantages
Wood
Natural and biodegradable product
Good design features
Versatile
Natural grain effect
Colour change
Good thermal performance
Aluminium
Versatile
Wide price range
uPVC
Disadvantages
uPVC
Restricted design types
Relatively expensive to colour
Low market awareness
Aluminium
Poor insulator (sound and thermal)
Like for like: expensive
Can corrode, especially in coastal areas
Timber
Some wood can rot, shrink and swell
Requires regular maintenance
Difficult to double glaze -> drainage issues
Can have security issues