Older films or newer films on Blu-Ray?

[Blu-21]

Which type of films do you generally find more impressive in terms of wow factor on Blu? I know every individual film is different and there are a lot of variables etc, but overall, are you more impresst about the crisp clean sharp images of newer films with eye popping colours like Avatar, The Avengers, Transformers, animated films, Iron Man, Inception etc) or older tittles that previously looked to be in rough shape on older formats but have since gone through frame by frame remasters or restorations for a Blu-Ray release or because they were so well shot like The Terminator, The Godfather, 2001: A Space Odyssey, Blade Runner, Ben Hur, Alien, Aliens, Lawrence of Arabia etc.. etc..

Lets classify "older films" from the 80's and before..