Best way to copy sql databse from one server to another server

Hi,

What is the best way to copy sql database from one server to another server? (include time constraints)

DB Size: 11GB

Copy methods:

1. Detach the database from the old server and attach it in the new server
2. Back up the database in the old server and restore it in the destination server
3. Using copy database wizard in SQL Server Management Studio
4. Generate the create script using Generate Script Wizard (SSMS)  and execute it in the destination server
5. Using Transfer Object in SMO
6. Database publishing wizard

Reference: Move a database from one server to another server in SQL Server 2008