The deals are different. It has become a real sport here in the USA to get there before the sun is up for the early deals. Some of these "doorbusters" are limited in quantity and people take a number - others are limited in time - ie after 11 am the price goes up.
My experience with black friday is that you DO have to go early, and plan your shopping. It helps to know where the item you want is located. It also helps to go in teams with a list - that way if one person doesn't get the item, another person on the team (family) might see it on display first. Also, when working teams, carry a cellphone.
Cyber Monday is great for AFTER black friday deals, or if you can't get to black friday. And many cyber Monday deals are ongoing through the weekend before the monday.
Here is some more about it - probably a good spot to watch for deals being posted.