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
14 R1200 GSA (Hopefully lasts longer than 2yrs)
12 R1200 GSA ("Sandy") (Hit by DUI)
09 R1200 GSA (Totaled by SS Sandy)
06 Husky TE450, 04 R1100s BCR, 03 F650CS