As has been mentioned, the 2005 sides were miles better than the 2009 sides. Particularly in the bowling attacks.
IMO
Johnson
Siddle
Clark
Lee/Hauritz/McDonald
Doesn't rate anywhere near
McGrath
Lee
Gillespie
Warne
Obviously Gillespie was in poor form, but a very good test bowler none the less, and Lee wasn't setting the world on fire, but in McGrath and Warne you had the two best test bowlers.
Then, the openers.
Hughes
Katich
Hayden
Langer
Hayden and Langer win hands down.
The middle order
Ponting
Martyn
Clarke
Katich
Gilchrist
Ponting
Hussey
Clarke
North
Haddin
I'd say 2005 wins again, but that would be close.
Englands bowling attack was much better in 2005 compared to 2009, IMO.
Harmison
Hoggard
Jones
Flintoff
Giles
Harmison, Hoggard, Jones and Flintoff were in brilliant form, unstoppable. Giles was the tweaker, and he wasn't bad, playing a role similar to Paul Harris.
Anderson
Broad
Flintoff
Swann
Onions/Panesar/Rashid/Sidebottom/whoever else
Doesn't even compare.
Overall, the 2005 teams were better than the likely 2009 teams, in form, player performance, and on paper (even though that's irrelivant), and by some margin.