The correct answer is "It depends"
For a good rider, capable of doing it in a day (like you) - clockwise.
But for a feeble old lady like me, then anti-clockwise works better. I reckon the "deciding" sections are Rooley Moor Road and Gorple Road. I walk up the steep section (bike makes a very handy off-road zimmer frame
), and then ride the long gentle descent.
Going clockwise, you'll obviously ride the long gentle ascent, followed by the steep descent. For me, there'd be a risk of having to walk up and then walk down the other side
Might the comments on the PB website be from horse-riders? I'm sure a horse would prefer anti-clockwise!