That's an excellent question that many city planners and facility managers consider. While the initial price tag might suggest one option is cheaper, the true comparison requires looking at the total lifetime cost.
Typically, a standard plastic urban trash bin has a significantly lower upfront cost than its galvanized steel or aluminum counterpart. You might pay 30-50% less initially for plastic. However, the lifetime story changes the calculation.
Plastic bins are lightweight, corrosion-resistant, and won't dent from minor impacts. They perform well in various weather conditions without rusting. Their main weakness is brittleness in extreme cold and potential for cracking or fading under prolonged UV exposure. A well-made plastic bin in a moderate climate might last 5-10 years before needing replacement.
Metal bins, though more expensive to purchase, are incredibly durable. They resist vandalism better, are less likely to warp, and can handle heavier loads. A quality galvanized steel bin can easily last 15-20 years or more with minimal maintenance, perhaps just needing an occasional touch-up paint job.
Therefore, the lifetime cost comparison hinges on your replacement cycle. If you factor in purchasing two or even three plastic bins over the lifespan of one metal bin, the metal option often becomes more economical in the long run. Additionally, metal bins may have higher scrap value at end-of-life.
The choice ultimately depends on your specific urban environment: budget constraints, climate, vandalism concerns, and waste collection methods. For a tight initial budget, plastic wins. For maximizing long-term value and minimizing frequent replacements, metal is frequently the wiser investment.