Biggest difference between Audioquest power cables against Shunyata power cables?

Hi everyone I upgraded/ bought another couple of power cables for my system. A Audioquest nrg1000 for my tube preamp and A Zitron alpha analog for my tube power amp. Though the imaging is better with the two power cables switched. I also did notice that it seams that shunyata gives a bit more juice in the power amp. And the cord end dose not heat up at the cord end to the tube power amp? Has anyone experienced or has a nrg-1000 in a 120watt tube power amplifier?