Best power cord for a preamp?

I’m using a Zenwave 14ga silver PC. Not cheap by any means but it brought my Backert Labs Rhythm 1.3 to another level.

I like Cullen Gold series power cables.

I’m presently running MIT-AC2 cables for my Spectral 30SS. they are about 10 years old. I’m looking at the newer MIT-AC2 cables. They look like they have been improved and they play well with Spectral. Might be just a lateral move?

The Hemingway  cables look very interesting to me. Read good thing about the cables. There is a posting on agon now also on what’s bests website.

Joe