That's a great question that cities and property managers consider all the time. The main differences really come down to durability, maintenance, cost, and how they handle the elements.
Plastic bins are generally lighter, making them easier to move and install. They're also resistant to rust and corrosion, which is a huge plus in coastal or rainy areas. You don't have to worry about chipped paint, and they're often less expensive upfront. However, they can become brittle in extreme cold, may fade or crack in intense sun, and can be more susceptible to damage from vandalism or fire.
Metal trash cans, typically made from galvanized steel or aluminum, are the classic heavy-duty option. They are incredibly sturdy, offer more weight to deter tipping, and are usually more resistant to fire and extreme heat. The downside? They are prone to rust over time if the coating is damaged, they can dent, they're heavier to handle, and they often come with a higher initial price tag. In terms of aesthetics, metal can offer a more traditional or industrial look, while plastic allows for more color variety and modern designs.
For long-term cost, plastic often wins on initial purchase, but metal might last longer in high-traffic, tough environments. It's a balance between upfront budget and long-term durability needs. Many cities use a mix, placing heavy-duty metal bins in central locations and lighter plastic ones in quieter parks or residential areas.