Vicodin (Hydrocodone) comes in many different names (Vicodin, Lortab, Lorcet, Norco, etc). Usually you get a generic from the pharmacy unless your Dr writes DAW on your script. Watson is a pretty large generic drug maker and is actually preferred by several. Mallinkcrodt is another large generic drug maker but there have been several people saying that Mallinkrodt is not as strong and many people will specifically ask not to have Mallinkrodt brand. Of course the make many other generics, but Watson seems superior to them.
I usually post at the Pain Management board, and you can find a ton of information about Mallinkrodt there.