Choose to have posts hidden or accented. Posts do not have to be concreted. We can still use red cedar rails and pickets. The advantage of red cedar over treated pine is less warping. The pine has a manufacturer's warranty against rotting and insect infestation, whereas, the cedar does not.
Most people feel the red cedar is much prettier.
We recommend staining or treating on either one for the longest lasting fence, but it is not required. If you choose not to stain, the wood will turn a gray, weathered look. You choose which one best suits you. There is no price difference in choice of wood, only in style.