uPVC is the more affordable, everyday option. It’s thicker, usually comes in white (or woodgrain), and does the job well for insulation and low maintenance. Aluminium is the more premium option. It’s much slimmer, stronger, and gives a cleaner, more modern look with bigger glass areas and more colour choices.

Put simply:

uPVC = cheaper, thicker, practical

Aluminium = stronger, slimmer, more premium