The pressure treated looks kinda shabby after a few years.I'm not a fan of the synthetic.I am going to rebuild mine next year all redwood.The one I have now is redwood and was built in 76.The only thing that is rotten is the pine floor joist supporting it.I am told they put rubber tape on them now to help that
Redwood is far from being the same everywhere. Avoid the incredibly light stuff from new growth ("sustainable") sources. It grows too fast so it is soft and lacks decay resistence.
Cypress is incredible, but is slippery when wet.
