I'd rather do 3 laps of Cwmcarn … than one of Skyline!
Oh lets all compare apples with pears eh?
I've not done the CwmDown DH, but there is no real 'tech' on the XC loop, at all.
The descent down to the carpark has no 'weavy and windy' bits, there are no turns, is just wiggles a bit, you can straight line the lot, if you forced yourself up and down the wiggle to try and make turns that are not there, is still not much more fun. Just full speed, flick a bit of air off the rises and then jam the brakes on for the hairpin at the bottom. zzz. After all the climb (which I quite like) you loose all your height, very quickly, for seemingly no reason. I'd rather do the whole loop in reverse.
I used to quite like CwmCarn, years ago when first built, when it was very green. I went back for the first time in ages a few months ago for a couple of laps, and was completely underwhelmed. The erosion makes it like a motorway in places, has blown most of the corners to smithereeens, lost any sharp turns, has lost those awesome off camber sphincter puckering turns just as the final descent starts and while I'm no air mrechant, airtime is predicatble and boring.
Clubber, no I don't rate it. Even if you're moderatly fit, Energy seems to require an awful lot of energy to get anywhere. I quite like the boardwalk, but most of the trail is a pootle, not a rad-fest.