I've had both. The Z center has the ability to isolate your preamp, DAC, and CD player. Can only handle medium size amps. A great product. The ultimate outlet cannot isolate your components. It is recommended to have one for preamp, one for digital, and one for amps. It will handle any size amps though. Can be expensive. If done right though, it is simply amazing and in my opinion, outperforms all power conditioners since there is no restricting of the power or sound. Much more open sound.