Shunyata Zitron Cobra vs Transparent Reference G5

I would say Shunyata however your sound quality will suffer with IEC converter maybe look at something else.

 I have all ARC Ref gear including a Ref 5se.  I use Shunyata Zitron Alpha HC power cords on everything. It is an extremely good match. I have felt no need to upgrade. The HC (High Current) version is better than the regular for pieces that have lots of tubes. I have not tried the Cobra power cords but I would imagine they would work well. Before I had the Alpha HC I had the Shunyata Black Mamba HC. They also worked really well. I would not use a 15 to 20 amp converter.

I believe that ARC uses a lot of Shunyata gear at their shows.

ARC uses Shunyata pcs in their listening room and Transparent interconnects. Check the video tour on the Analog Planet website.
I use Shunyata pcs and ics and I am happy with them.
Maybe one day, I’ll try Transparent ics but not the top of the line that cost as much as my speakers. I will never spend tens of thousands of dollars on cables unless they also do the dishes.