That's a great question that gets to the heart of practical urban planning. Having maintained both types, I can share that the maintenance experience is quite different.
Concrete trash cans are champions of durability but require specific care. Their main advantage is incredible resistance to vandalism, weather, and fire. You rarely need to worry about dents, deep scratches, or rust. Maintenance mostly involves routine cleaning; a power washer works perfectly on the non-porous, coated surfaces of modern concrete bins. The major drawback is weight and brittleness. If they crack from a severe impact, repair is difficult—often requiring complete replacement. They also tend to be stationary, so cleaning around and underneath them is crucial.
Metal trash cans, typically steel or aluminum, offer a different profile. Galvanized or powder-coated steel is common. Their maintenance is more frequent but often simpler. You'll regularly deal with surface issues: scrubbing off graffiti is easier, but you must watch for scratches in the coating that can lead to rust spots, requiring touch-up paint. They are prone to dents, which can affect lid operation and aesthetics. A big plus is that many are lighter or have removable liners, making waste collection and interior cleaning simpler. However, in coastal or high-moisture areas, corrosion can be a constant battle.
So, which is lower maintenance? For long-term, hands-off durability with minimal repair worries, concrete often wins. It's a "set it and forget it" option, aside from cleaning. For easier daily handling, graffiti removal, and flexibility, metal bins can be simpler to manage day-to-day, but they demand more vigilant upkeep to prevent corrosion and damage over a 10-15 year span. The choice often boils down to your specific urban environment and maintenance crew's capabilities.