If we are talking "20th Century" Who, then I would say The Caves of Androzani. And if we are talking "21st Century" Who, then Army of Ghosts/Doomsday. Both directed by Graeme Harper.

I was in two minds wheather to say The Brain of Morbius for the "C20th" Who one, but I didn't. I thought Caves was directed better.

Gareme Harper is IMO the best "Who" director. Anyone agree with me?

In Modern Who I would say most of the directors have been fantastic since Moffat took over. From The Eleventh Hour onwards there has been far more attention and artistry and the cinematography in general moved to another level. I found during the RTD era that the direction was often functional but lacked flair to the extent it often looked like an episode of Doctors or any other point and film BBC show. Yes it did the job but was rather flat and perfunctory. And this means the episodes look alot cheaper and betray their limited budget.

With Moffats era they have employed directors who aren't afraid to use a distinctive visual style and play with the tools available whether that be with the framing of shots or movement of the camera etc etc. It has certainly become more filmic. Watching something like Journeys End now it looks very simplistic when compared to something with the massive scope of say Day of the Moon which was like a mini movie. As someone who is very much drawn to the visual side of things I have loved this. And I would place my bet now and say that Ben Wheatley will probably top the list with his forthcoming episodes. Having followed his career he sums up the difference between RTD Who and Moffats when it comes to direction.

Agreed, they're all superb. I'd add Hettie MacDonald to the list too - I'm not the biggest fan of 'Blink' as a story but her direction is fantastic.

Go along with those too. For C21 Who would also agree with Nick Hurran and would add Richard Clark, who did great work on The Doctor's Wife, Gridlock and Night Terrors.

As regards C20 Who, Douglas Camfield, obviously, Michael E Briant, David Maloney, Graeme Harper and Peter Grimwade spring to mind, the latter particularly for Kinda. Later on, I thought Alan Wareing was the pick of the bunch; thought he did superb work on Ghostlight, Survival and, particularly, The Greatest Show in The Galaxy.