HiDiamond power cable P2 vs P3

Hi,

I'm hoping someone can give a comparison of the P2 compared to the P3 power cord? I'm very tempted to try HiDiamond but I'm not sure which one to try. The P3 is a bit out of range but I'd be willing to spend a bit more if the difference in sound quality is large (enough)...

What are the main differences between the cables in terms of sound?

Hope someone can help.

Thanks in advance!