3do
say what you want about Paul W.S. Anderson but his recent films have been consistent in 3 things: great soundtrack, good sets, and epic 3D
pass Real 3D
Animated movies and movies shot with a 3D camera will result in a better 3D experience.
These movies exist for blood, bullets, knives and explosions. If that's your thing and you're planning on watching this movie, you will probably enjoy the 3D version more. Expect all those things flying at your face during most of the movie. Besides that, it was shot in true 3D which is always a good sign.
say what you want about Paul W.S. Anderson but his recent films have been consistent in 3 things: great soundtrack, good sets, and epic 3D