I wouldn't worry too much about the difference in tech, guys.

It's due to 30 years in advanced filmmaking technologies. In this day and age the envelope must be pushed to attract big audiences

The difference in technology within the films' universe(s) can be attributed to the differences between the vessels' purposes. The Nostromo was an old, battered towing ship. It didn't need a lot of advanced tech. The spacecraft in Prometheus is a top of the line scientific research vessel equipped with all the bells and whistles. It really does make enough sense so as to not be a distraction, at least to me.