You definitely want to make sure your cart is ruggedly constructed so it can stand up to years of use. Aluminum models weigh less, which is something to consider if you need to climb stairs. Metal construction offers strength, but they can rust and may require occasional paint touch-ups. If you’re going to use your cart for heavier outdoor chores, however, (hauling firewood or bags of fertilizer), a metal, wagon-type design is probably what you want. Solid rubber tires will never go flat, but inflatable tires roll easier, so carts are easier to pull. Wide tires are best for pulling carts across sand as they won’t sink it—something to consider if you’re cart will see a lot of beachside use.