Here we go again with the usual Cannock bashing. It’s a fun trail centre and doesn’t pretend to be anything it’s not- nice and flows and fun. Not massively technical or challenging – if you want something a bit more gnar then there is Style Cop, but I’ve never been to a trail centre that is massively challenging or technical, even the Welsh ones and the couple of Scottish ones I’ve been to (excluding the more DH orientated ones). They may be better than Cannock, but not like in a whole other league – just similar but alot more of it and alot bigger terrain, but some just feel like the climbing to descending ratio is worse.
I wouldn’t necessarily advocate making a special trip to Cannock just solely for Cannock, but given the OP’s situation the only sensible and viable options if he wants to spend more time on the bike than in the car, are Cannock or the southern end of the Peaks. Wales is way too far and Welsh roads and roads west of the M6 are SLOW so will take longer than Google Maps says it will, I’ve done the Long Mynd and, well, I won’t be rushing back. I’m sure there are lots of secret off piste runs that are fantastic, but if they’re secret then that’s no good for the OP so all irrelevant really.
So if all the OP wants is to get out on the bike for a fun and easy blast with convenience, then Cannock will fit the bill. If he wants something bigger, more challenging, getting out into the wilds a bit more, but with less convenience then the Peaks will fit the bill.
By the way, it’s raining now so by tomorrow the trails at Cannock will have dampened down a bit so won’t be as slippery as they have been recently.