I can see where your dilemma is. The Leadtek looks more elegant and clocked higher.
It would seem that the Club 3D is green because the clock is lowered than stock so it is a bit handicapped to save power. And yet, it has 1GB RAM.
It would be better if you let us know of your monitor resolution to determine if the 1GB RAM of the Club 3D will matter and the lower clock will affect your gameplay much.