TOS one, for sure. While a valiant effort, I think the BOG one looks a little bit like the "Creature From The Black Lagoon". The face is too humanoid looking, like a dude in a suit. The TOS Impy's mouth and eyes are far more alien-looking, IMO.
I am curious why they didn't make a greater attempt at making it more closely resemble the original. Budget considerations, I imagine. IIRC, the Sidi Full-Bore motocross boots that Colonials war in TOS were replaced by black shoes w/ strap-on leggings in the BOG ride that make them look like the original boots from a distance. Probably a good thing for the purposes of getting in and out of the costumes quickly. I have a set of the newer Sidi's that came out a decade ago and, even though they have one less clasp than the originals, they take for-bloody-ever to put on and take off. I literally broke a sweat trying to get into those things, but damn, they do
look good!
So, I suspect BOG Impy likely suffered the same sacrifice of authenticity in favor of practicality and efficiency.