Whilst Steven Moffat is more famous than Davies in terms of scariness, RTD did produce one of the more frightening Tenth Doctor monsters, in the 'Midnight' entity. What was so scary about it was that it was totally unknown, and that it brought the true side out of the entire carriage. Moffat has of course given us the Silence, the Weeping Angels and the Whispermen, as well as the Vashta Nerada - who surely have to return one day - and he wrote one of the series's most frightening episodes in 'The Empty Child'. He's tried to upgrade the Cybermen and show the Daleks in more evil lights too, building Davies's stories, and both writers have done well to show brutal savagery from the Daleks; it's a shame in a way that they're so universally loved, as they'll never be as scary as they once were. Both writers are unafraid of showing the Doctor terrified by his foes too; the scene in 'Asylum of the Daleks' when the intensive unit corner Eleven mirrors Nine's reaction to the last Dalek in 'Dalek'.
