Short answer: wooden benches need more maintenance than metal benches, but the gap depends heavily on the material you choose. A good teak or cedar bench might need a solid clean and a recoat of oil once a year. A cheap pine bench will demand regular sanding, staining, and sealing. On the metal side, powder-coated aluminum is almost maintenance-free, while chipped or uncoated wrought iron can become a rust problem if you ignore it.
Let’s start with wood. Wood moves with the weather. It expands in humid air, shrinks in dry heat, and soaks up moisture when it sits in shade or on wet ground. That movement leads to small cracks, raised grain, splinters, and loosened joints over time. The basic routine is simple: wash the bench twice a year with mild soap, water, and a soft brush. If you have teak, ipe, or another dense hardwood, you can let it go silver-gray and it will still last for years. If you want to keep the warm brown color, apply a teak oil or hardwood sealer once or twice a year. For softwoods such as pine or fir, you really need to keep a protective paint or stain on the surface. Plan to lightly sand rough spots and recoat every two to three years. Also keep wooden legs off wet soil or grass. Small paving stones, deck tiles, or plastic feet under the legs will prevent the end grain from wicking up moisture and rotting. That one habit saves more benches than any sealer.
Metal benches are not all the same. Powder-coated steel and wrought iron look classic, but their weak point is the finish. When the coating gets scratched or chipped, bare metal is exposed to water and oxygen, and rust begins. Maintenance for these benches means washing off dirt and salt a few times a year, then inspecting for chips or rust spots. A small rust spot can be sanded lightly, cleaned, and covered with touch-up paint. In a damp, humid, or coastal climate, wrought iron may need a fuller repaint every three to five years. Aluminum benches are much easier. Aluminum does not rust, so a powder-coated aluminum frame only needs an occasional wash with soapy water to remove pollen, sap, bird droppings, and grime. Stainless steel is also low-maintenance, though in coastal salt air you should rinse it with fresh water now and then to prevent tea staining.
In real terms, a wooden bench might take a half-day once or twice a year for cleaning, oiling, tightening bolts, and inspecting for rot. A metal bench often takes an hour or two every few months for basic washing and maybe a quick touch-up. Over five years, wood usually costs more in time and products, unless you choose a naturally durable hardwood and accept the gray patina. Metal is generally easier, but neglected damage on steel can spread quickly and become a bigger repair than oiling a wooden bench.
If low maintenance is your main priority, choose powder-coated aluminum. If you love the warmth of wood, choose teak, cedar, or acacia and commit to a simple annual clean-and-oil routine. Avoid cheap untreated softwood unless you genuinely enjoy refinishing. No matter which material you choose, keep the bench clean, keep hardware snug, and keep the legs out of standing water. That basic care will solve most outdoor bench problems before they start.