Both cypress and cedar are popular materials for a porch swing and for good reason. However, in terms of durability, cypress holds an advantage over cedar.  Cypress produces cypress, a chemical that acts as a natural insect repellent and protects against rot, warping, and decay. Cedar is resistant to insects as well and is naturally resistant to rot. It’s just that cypress is a tad bit more durable against decay. Both are softwoods, though cypress grows near hardwoods and is a bit stronger than cedar. However, if properly maintained and covered, a cedar swing can have a long life.