There is no doubt here, even for a tiny little second. The Sarah Jane Adventures. A cool car, good writing, a super mix of characters even down to the bitching between Mr Smith and K9. Good villains like Androvax and the Trickster, and appearances by the 10th and 11th Doctors.
When we were at Starfury: Midnight in December, Gary Russell, the script editor for SJA said that when Matt Smith and David Tennant were on the SJA set, they gave total respect to Lis, as it was her show and they followed her leads.
My second choice would have been K9 and Company purely because it was a chance to see Sarah Jane again.
Now, Torchwood. Loved it despite the violence and strong thread of misogyny in the writing. Not even in the same sport, let alone the same league as SJA, though.