Resin, metal, or wood — which shed material lasts longest?

Across the reviewers and specialist communities we read, resin/HDPE sheds get the most praise for low maintenance: they don't rust, rot, or need painting. The trade-off, repeatedly flagged in r/Shed and r/shedditors threads, is UV-related warping on the sun-facing wall after several years. Wood lasts longest if maintained but requires sealing; metal is cheapest but dents and rusts at seams. For most homeowners storing tools or a mower, resin is the consensus low-effort pick.