Well, care to say what you did to the photos? So that I have a better understanding and focal points...
Anyway, based on what I can differentiate, it's the colours and lines.. the top one is definitely better.
However, if the cars are your subjects, do something to the background (blur it). With cars, it's very easy to do a selection, inverse and blur the bgd.
Of course you don't blur the foreground (the road, etc.) to maintain realism.
EDIT: Oops, i didn't see the previous thread about this comparison... i tot your previous meant another set of photos... pls forgive if anything has been mentioned previously.