you know that's a tough one, all three are from different nations, lamborghini is italian but supplied by VW AG, Ferrari is pure italian and Aston Martin is British.
I personally enjoy Aston Martins for its curvaceous and unified design. its like a present wrapped together to match even ends. The DB9 was a purist grand tourer with the luxury that will fit the mood of any owner.
Lamborghini whatever the model is wide loud and furious. There were made for the entrepreneurs who want to be seen regardless of daylight.
The Ferraris are designed for speed on the road and on the track. They take min. effort in confort are built to envelop the driver in a cocoon. its the loudest and lightest of the three and the most ferocious especially the F430 Scudera.
In conclusion, in a matter of opinion, I personally would go for Aston Martin bar none. You can just stare a the mouth of the DBS all day and still not know what she's saying.