The answer to 'P-trap vs' is that a P-trap and a S-trap are both types of plumbing traps used under sinks and other fixtures to prevent sewer gases from entering the home. The main difference is the shape of the trap. A P-trap has a U-shaped curve, while an S-trap has an S-shaped curve. Both traps work by holding a small amount of water that creates a barrier to block odors and gases from the sewer or septic system.
P-traps are the more common and recommended type of trap for most residential plumbing applications. They are easier to access and clean, and less likely to siphon out the water seal compared to S-traps. S-traps are an older design that can be prone to issues like siphoning and clogging. For new construction or plumbing renovations, a P-trap is generally the better choice for cost, functionality, and long-term performance.