A few of the power strip style SEEM to sound better, but offer no 120 VAC maintenance. They are not made to make thing sound better.
The reason is safety, maintenance, and surge. Filtering is kinda hit and miss usually above 20khz and again at 40khz.
I don't use them to make my stuff sound better, I use them to protect the expensive gear, and START from a good place. My conditioners are on a journey for sure, but they constrain NO sound to my ears...AND from any of the amps I use. I use a FEW different amp types. A good power supply in the amps to begin with goes a long ways too.
Safety, protection and sound. there is no need to give up any of them...
Regards