Im not a suspension guru so all I can say is I dont really agree with that statement.
My 2012 TDI dsg wagon with same size 18s with similar tires [probably better tires on TDI] and upgraded rear sway [drawing a blank on size

] To me doesnt feel nearly as good as my 08 GTI does stock. And stock to stock wasnt close.
Now I dont know how both would perform side by side on say a track but I would say the GTI to me just "inspires" more confidence.
If I had to do it all over again I would have searched for a 2.0T Wagon and then done suspension mods.