My favourite is the 3rd.
Sets I own: Gardiner; Harnoncourt; Konwitschny; Sinopoli; Solti; Zinman.
I actually think they are all very good! (I was contrasting this feeling with that in regard to the available Schubert sets: a very different situation in my opinion). I grew up with the Solti, so have a nostalgic attachment. If I had to pick one, it would be between Konwitschny and Sinopoli.