I ride them both and espically Llandegla as its much closer to me. Its a great trail and the latest addition are up there as some of the best bits of man made trail, you could do 2 days there, but after a whole day you will easy cover most of what it has to offer or add in some of the ride the clywds routes.
CYB is ace, unfortunaly it is an extra hour each way for me so dont do it as much as I would like to. If your spending a few days doing trail centers you are probably better heading over that way, but if it was me I’d plan to spend one of the days doing Penmachno and if you have the fitness get a quick Marin in as well.
The Degla cafe is way the better of the 2, if that helps…
You can get a good amount of degla done in a few hours, just add it in to your trip home 🙂
Its all good, enjoy.