HiDiamond P4 vs Nordost Valhalla PC

Has anyone done a comparo between these two PC's. I use the Valhalla from the wall to Audience AR6 power conditioner. Among the many PC's I have tried, Valhalla suited me best, except for Elrod Statement (original), which simply became too unwieldy in my system.

I am thinking of substituting the HD P4 for Valhalla, strictly based on the raves I have seen on this site (which I take with a small grain of salt but also respect) but would appreciate some input from those with personal experience. I also use LessLoss Sigs in various places in system, including from preamp to power conditioner and like that cord a lot.

Thank you.

Neal