Can't speak of the other two, but Santa brought me a hero 3 black and it's fantastic.
Friend of mine has the contour 2+ and I have lots of footage from him and this black is great. I also like that I can frame and control settings via the iPhone app which always mounted in my handle bars
12 R1200 GSA Sand Rover ("Sandy")
09 R1200 GSA (Totaled) Superstorm Sandy you Bit$%
06 Husky TE450
04 R1100s BCR