In 2005 England came back from a disappointing opening Test defeat and won with gripping, narrow wins. The fifth Test was gripping but in a different way.
In 2009 England so nearly went 1-0 down at Cardiff, hanging on with five wickets batting out over two sessions. Won comfortably at Lords and at the Oval while the promising situation at Edgbaston fizzled out into a draw. The aussies also won comfortably at Headingley so in terms of tight results it is 2-0 to 2005 with the last ditch batting of England to save the Test at Cardiff unrivalled in 2005.
I was wondering only yesterday if the fact that we went 1-0 down and won 2-1 makes 2005 'better' than being 1-0 up, getting hauled back to 1-1 and then win despite losing by an innings defeat in the previous Test. But 2009 we had to win to win back the Ashes, in 2005 we only had to draw and there were only three innings and a few balls at the Oval.
Of course there is the 'new feat' factor, that we'd won it in 2005 for the first time since 1987 and in 2009 it was the second home win in a row and second in three series overall.
Arguably 2009 was a bigger achievement as we didn't have Hoggard, Harmison, Jones and Flintoff firing on all cylinders, 24 wickets and 402 runs from Flintoff alone. And we had an in-form batting line-up, G.Jones, Pietersen, Trescothick, Strauss and Flintoff providing the main strength with other contributions. This series a lot of bowlers chipped in but were not so stand out in their performances, batsmen likewise with Cook, Bell, Collingwood and Bopara all having disappointing come poor series. Proof of the pudding is in we used like 12 players in 2005, it would have been 11 but for Jones' injury, but this series we used about 15 with Panesar, Onions, Bopara and Pietersen also used outside the winning XI at the Oval (if I haven't missed anyone)
Then again you could say 2005 was a much bigger achievement for the fact that the aussies had Langer, Warne, Gilchrist and McGrath back then - and Lee - and this series they had a relatively weakened batting line-up and much weaker bowling line-up.