Hello Jim,
Both are superb choices for your PS Audio Directstream DAC.
The "Obsession NCF", with the crazy expensive FI-50 NCF series of connectors ($385 & up EACH!), has 20% more conductors than the already beefy "High Power Digital American".
The "Obsession NCF" will provide a bit more deeper bass response and a bit more airy & effortless highs, while still remaining balanced. Depth of recordings will appear deeper & wider, while still focused...
I hope this helps...
Cheers,
Pete