IMO the best Giger Alien by Neca is from the last wave... the dome is perfect (together with the bloody one). In the 40th anniversary is too transparent.
I've the ultimate big chap and the bloody big chap, and I noticed that the "bloody" has a dome with a very good paintjob... better than the ultimate. I hope that this version is close to the "bloody" version (obviously without the blood).
Usually, the prototypes are better than the commercial ones. In this case we have a prototype used in a photographic set... these mistakes are insensate.