What They Are
Vinyl siding: PVC (polyvinyl chloride) panels. Most popular siding in America (30%+ market share). Available in clapboard, board and batten, shake, and Dutch lap profiles. Wide color range (color goes through entire thickness). Cannot be painted (but doesn't need to be).
Aluminum siding: Thin aluminum panels (0.019-0.024 inch). Was popular 1940s-1970s (before vinyl took over). Baked-on enamel paint finish. Can be painted any color. Being replaced by vinyl in most applications. Still preferred in some coastal and fire-prone areas.
Cost
Vinyl siding: Material: $2-$7/sq ft installed. Budget (basic vinyl): $2-$4/sq ft. Mid-range (insulated vinyl): $4-$7/sq ft. Premium (shake or board and batten): $5-$10/sq ft. Average home (1,500 sq ft siding area): $3,000-$10,500.
Aluminum siding: Material: $3-$8/sq ft installed. Standard: $3-$6/sq ft. Premium/thick gauge: $5-$8/sq ft. Average home (1,500 sq ft siding area): $4,500-$12,000.
Comparison: Vinyl is 10-20% cheaper than equivalent aluminum. Both are cheaper than wood, fiber cement, or stone. Installation labor is similar for both.
Durability
Vinyl: Lifespan: 20-40 years. Does not rust or corrode. Does not rot or attract insects. Can crack in extreme cold (below -20°F). Can warp or melt in extreme heat. Fades over time (especially dark colors). Can crack from impact (baseballs, hail). Not paintable (color is integral).
Aluminum: Lifespan: 40-50 years. Does not rust (aluminum oxide coating protects). Dent-prone (hail, baseballs, ladders). Dents are permanent (cannot be popped out). Scratches show bare metal (must repaint). Fire resistant (won't melt like vinyl). Performs well in extreme temperatures. Can be repainted when color fades.
Maintenance
Vinyl: Annual cleaning: pressure wash or scrub with mild detergent. Replace damaged panels (individual panels replaceable). No painting ever. May need occasional caulking at trim. Check for loose panels after storms.
Aluminum: Annual cleaning (same as vinyl). Repaint every 10-15 years ($2,000-$5,000 for average home). Touch up scratches (to prevent corrosion at scratch). Dented panels may need replacing (cannot repair dents). Oxidation over time (chalky surface — indicates time to paint).
Winner: Vinyl is significantly lower maintenance. Aluminum's need for repainting is the main disadvantage.
Best For
Choose vinyl siding if: Budget is a priority. Low maintenance is important. Wide color/style selection desired. Cold climate (flexible, won't dent from hail like aluminum). Typical residential home. Want lifetime warranty (many vinyl products offer this).
Choose aluminum siding if: Coastal area (salt air — aluminum won't corrode like steel). Fire-prone area (aluminum is non-combustible). Want ability to change color later (paintable). Extreme heat climate (won't warp like vinyl). Industrial or modern aesthetic preferred. Historic restoration (matches original aluminum).
Consider alternatives: Fiber cement (HardiePlank): premium durability, paintable, fire-resistant. $6-$12/sq ft. Wood siding: traditional, requires painting/staining every 3-7 years. $6-$12/sq ft. Engineered wood (LP SmartSide): combines wood appearance with composite durability. $4-$9/sq ft. Stone veneer: premium accent. $15-$30/sq ft.