They both look great kits
im going for the Dragon, its got more options like new or worn tyres
early mid or late muzzel brakes and wheels
heres a link to the Dragon Pak 40
http://www.dragonmodelsltd.com/html/6249-p2.htm
heres a reveiw of the AFV Clubs Pak 40
http://www.perthmilitarymodelling.com/reviews/vehicles/afvclub/afv35071.htm
but its a early type with the rare wheels
bothe have metal barrels