The answer to 'P-trap vs' is that a p-trap and an s-trap are both types of plumbing traps used to prevent sewer gases from entering the home. The main difference is the shape of the trap. A p-trap has a U-shaped bend that creates a water seal, while an s-trap has an S-shaped bend. P-traps are the more common and preferred option for most residential plumbing applications due to their more reliable seal and easier maintenance.
P-traps are generally easier to install and unclog if they become blocked. They also provide a more consistent water seal to keep odors out, whereas s-traps can lose their seal over time. P-traps are also less likely to siphon, which can cause the trap to dry out. For these reasons, p-traps are the standard choice for sinks, tubs, showers, and floor drains in most homes.