That's an excellent and very practical question. The price difference between plastic and metal urban trash cans isn't just a simple matter of one being cheaper than the other. It involves upfront cost, long-term value, and the specific demands of the location. Generally, you'll find that high-density polyethylene (HDPE) plastic bins have a lower initial purchase price. Metal trash cans, typically made from galvanized or powder-coated steel, usually command a higher upfront cost.
However, the true comparison begins after installation. Plastic bins are lightweight, rust-proof, and resistant to many chemicals, leading to very low maintenance costs. Their color is molded throughout, so scratches don't show as easily. They won't dent like metal but can become brittle and crack in extreme cold or from prolonged UV exposure. Metal cans are significantly more durable against impact, vandalism, and extreme heat. They are heavier, which makes them harder to tip over or steal, but they are susceptible to rust if the coating is compromised, requiring repair or replacement.
For a city park or a pedestrian area with moderate use, a plastic bin might be the cost-effective choice, offering good service life for its price. For a high-traffic urban center, transportation hub, or area prone to rough use, the superior durability of a metal bin often provides better long-term value despite the higher initial investment. The decision ultimately hinges on your budget, expected lifespan, maintenance capabilities, and the specific "urban environment" the can will serve. Always factor in the total cost of ownership, not just the sticker price.