my 2p
wood is best for riding, structures can be moved, but high maintenance, surface will need to be replaced every 2-3 years
metal is worst for riding, structures can be moved, low maintenance, Leigh-on-sea's surface lasted about 10 yrs (wood underneath was another matter)
concrete starts slippy and gets grippier with age, but build a crap bowl and you can't change it, very low maintenance