Dragons can still swat away fairies with other coverage moves. Dark got a buff against Steel and an indirect one, now that Dark and normal are the only Ghost resisters. Fighting types can learn Poison moves to beat Fairies. Bug gets Sticky web
Steel, on the other hand, lost two resistances, gained 1, and got an SE. Except that Poison is also SE against Fairies and poison moves seem more widely distributed, which kind of makes Steel's SE less useful unless it's STAB.
It's pretty close between Dragon and Steel. Losing two resistances is pretty big.. especially in the case of Metagross and Jirachi who just gained two weaknesses in what was otherwise a fantasic defensive typing. Despite this, steel is still the go-to defensive typing and is one of only two types that has an edge over fairies.
Dragon is completely checked by fairies. Even if a lot of fairies aren't much to write home about, being completely immune to Dragon AND being threatened by SE STAB really changes how many dragons are going to play. Outrage is now pretty risky if you don't take care of enemy fairies.