Well I can only comment on the ones I played, but back in the day I spent hours with these two:
If we were going to include graphic adventures, obvious monkey 1&2, but two other favourites of mine are:
Indiana Jones & The Fate of Atlantis
I've very recently discovered that there was a last crusade graphic adventure before atlantis, which I have never played! It'll be one of the first things I try out when my A1200 arrives!