Hi, the main difference is scalos, the full version has this installed which is a workbench replacement, you can read about it just do a Google search. With 8mb I recommend the lite version because scalos makes the full pack quite memory hungry.
The other extra you get with the full pack is IGame which is a very nice whdload front end.
But I recommend 16mb to run the full pack and an 030 for the adv /adv sp & 3.9 packs.
There should be a more detailed feature list on the classic workbench website
