The main advantages of anodizing aluminium and other metals are the following

Cost
Anodising is less expensive than painted coatings. When the lifespan of the coating is considered it proves to be a cheaper option over the long term.

Hardness
It is harder than PVDF, and is better for aluminum in high traffic areas where coating is subjected to physical abuse.

Film Integrity
These cannot peel, flake, chip or blister. The coating is a metal element.

True Metallic Appearance
Anodising give aluminum more deeper, rich metallic appearance than organic coatings. This is because the coating is translucent, and one can observe the base metal under the coating.

Enhanced Resistance to UV
They have excellent long term resistance to sunlight. All other coatings will eventually fail owing to exposure to ultra-violet light.

Maintenance
These can be renewed by cleaning and is so cheap to retain over the lifetime of a building. It can over and over again be restored when it seems like it has failed, a lot of projects after twenty years of neglect are brought back to as new condition through cleaning.