There are a few reasons to consider a metal roof including its:
Durability
Various patterns & designs
Eco-friendliness
Ability to save on your insurance
You have to remember that this isn't the least expensive option. It can also be noisy during storms, like with rain or hail. However, if you are in a climate where no other roofing will last, then metal is the choice for you. The cost you put down initially will pay back quickly in how it protects your home.