Cool topic idea. It’s hard for an adventure fan who appreciates both Sierra and LucasArts to say which they enjoyed more – that would be me. Then again, there are some people who are strongly in one camp or the other.
Another point for the Pro LucasArts is that their animations were amazing. Their games had tons of animation and it really brought their games to life.
Pro Sierra I would add the awesome documentation and extras that came with most of their games.
Sadly I don’t have a single original boxed LucasArts adventure. I have the first adventurer’s pack, and then all the adventure games that came after that I have on stand-alone value CDs. So I don’t know of the cool stuff if any that came in LucasArts adventures.
Both companies had pretty cool hintbooks.