Which trailer wiring connector is best?

The best trailer wiring connector depends on your specific needs and vehicle type. Generally, the 7-way connector is preferred for its versatility, as it supports multiple functions such as brake lights, turn signals, and electric brakes, making it ideal for larger trailers. For smaller trailers, a 4-way flat connector is often sufficient, providing basic lighting functions. Ultimately, the best choice balances your trailer's requirements with your towing vehicle's capabilities.