The answer to 'best pressure regulator' is a pressure regulator that is properly sized and installed for your home's plumbing system. A good pressure regulator will maintain a consistent water pressure throughout your home, typically between 40-60 PSI. This helps prevent damage to your plumbing fixtures and appliances from high water pressure, while still providing adequate flow.
When selecting a pressure regulator, look for one that is rated for your home's maximum water flow and pressure. It should be installed near your home's main water shutoff valve. Many pressure regulators also include a built-in pressure gauge to help you monitor your home's water pressure.