Cannock is more groomed than degla, there’s bit on degla where there’s loads of stones and it’s all clattery, there’s nothing like that at Cannock. my tip for cannock is do the whole monkey, if you just do the dog you’ll end up back at the carpark wondering what the hell happened, it’s very short. If you have a whole day at cannock and the weather’s nice you could do the blue trail (flat family run) inbetween bits of the main trail, look for the signs just before you get to the campsite.
The blacks at Cannock are black, the bits at the top with all the rocks are awful and shatifying without a full suss and your saddle way down, so give them a miss if you’re not too confident, otherwise you’ll be walking down them and get someone shouting at you. The blacks at degla are like Cannock red, easy peesey.
Most of all have fun.