How do I fix having two admin user accounts?

Ok, when I did a clean install of Lion and used Time Machine to restore, I ended up with two Admin User accounts. I want to have one but don't know which one I should delete. Why? because every time I need to update an app, I need to log out and do it through my first admin user account. Once I update it there, my other apps are updated in my other admin user account. So why not just delete the new admin user account? Because I've installed more apps in that one.

Question, is there a way where I can migrate the settings of the old one into the new one?

 

What happens to all the documents, music, movies, etc, in the admin account after deleting the account?