I screened the ALIENS special edition extended cut Bluray for my film students which runs 2.5 hours but took 3 hours because I kept pausing it to comment on the film. I must say that I like the shorter theatrical cut better because it is concise and emphasizes the action elements while keeping the emotional ties & themes at a minimum without loosing much if you're really paying attention. Some of the suspense is drawn out in the special edition, which I still enjoyed, but it never added anything significant.
Can you believe that I actually saw ALIENS with my dad projected in 35mm during its theatrical run - imagine the impact a film like that would have on a 10 year old! I've now seen the film on 35mm film, VHS, DVD, and now Bluray. Looking forward to 4K.