Older vs Newer ... Shunyata Python Helix or Shunyata Delta NR

I’m looking for a cable from my wall to a Shunyata Triton power Conditioner in the $500 range.  Two that I’m considering:  the older but well regarded, Shunyata Python Helix (used $450) and newer Delta NR (on special for $450). Unfortunately, I cannot try either in my system before purchasing.  Has anyone compared these two models?