I really don't consider the film continuity that complex, the Alien Anthology is the "main continuity" and even though multiple versions of each film exist, nothing in any of the versions is so drastic a change that one version must be chosen, otherwise continuity is broken. The only major change in that respect- from Alien's Marketing (Inferior imo) Cut is the inclusion of Ovomorphing, considered canon by multiple sources in the new EU, so it's inconsequential what version actually happened. The only major change from Aliens' Special Edition is the inclusion of Amanda Ripley apart from that it's basically an extended edition, considered canon by multiple sources in the new EU, so it's inconsequential what version actually happened. The only major change from AlienĀ³'s Special Edition in that respect- is the inclusion of the Royal/Regular Facehugger distinction apart from that it's basically an extended (Superior imo) edition, considered canon by multiple sources in the new EU, so it's inconsequential what version actually happened. You get the picture.