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Winners: See pic. Perhaps an even bigger one than Gengar. Three new resists (though losing the steel one - but it resists Scizor's U-turn!), an immunity to the best attacking type (well, in B/W anyway, lol!), and a new STAB that gives him great coverage, with both STABs being resisted only by a few things, like Empoleon, Ferrothorn and Tentacruel. Look at how much things it can now beat: most Waters, Dragons, Fire types, Fighting types, Tyranitar...
Losers: Scrafty. It didn't have many advantages over other Fighters on the first place, and now even those vanish with the introduction of Fairies. Both his STABs are resisted and he has a 4x weak to their attacks. Steel losing a resistance to Dark is irrelevant - he could demolish them with his fighting moves anyway. Now, same as with Hydreigon, his even lower speed and average attack will reveal himself since his defining features are gone.