Power cords?

I have recently tried a couple of power cords the audio quest NRG-10 and the new Shunyata Z-tron Viper booth made a huge difference! the audio quest was good for my cary cd player in solid state mode but gave too much midrange bloom in tube mode.
For the amp I triode the shunyata viper bass was low and brought a better image and sound stage depth.
But the other way around.

The NRG-10 for the amp it limited how low the bass can go. also made the cary integrated have too much midrange detail but not a lot of depth in the in the sound stage! but made the cary CD player sound better for tube mode and solid state!

my Question is shunyata better for tube equipment over audio quest. My audio quest dealer only sales solid state products. And was the best seller in power cords in their store. I tried the shunyata from another dealer that sells tube amps.
And for the shunyata a 1.85m cord is $525 and audio quest NRG-10 is $779 for 6 feet.
I think price for performance the shunyata viper sounds better then the audio quest and a better price.
Has anyone agree or have compared them booth?

I have a cary sli-80 and SACD 303t Profesional version.