There’s no such thing as the perfect power supply. Systems that have four graphics cards and an eight-core processor require a certain kind of PSU, while home-theater PCs require a different PSU altogether. If you want to prioritize acoustics, there are fanless power supplies that are well-suited for the task. That said, for most builders the Dark Power Pro 1000W from German manufacturer be quiet! is about as close to perfect as possible.
First and foremost, the 1kW Dark Power Pro 11 is an 80 PLUS Platinumcertified power supply. To meet such exacting requirements, a PSU has to be extremely efficient under a wide range of operating conditions, and the Dark Power Pro 11 is. The power supply is 92.3%, 94.1%, and 93% efficient at 20%, 50%, 100% load, respectively.