Difference between Alter index and DBcc DBreindex

HI All,

I would like to know the difference between Alter index and DBCC DBreindex and  from the below URL i came to know that DBCC DBREINDEX feature will be removed in future versions of SQL Server and they recommend to use ALTER INDEX instead.

http://msdn.microsoft.com/en-us/library/ms181671.aspx

And i would like to know if ALTER INDEX has performance gains as they are planning to de-support DBCC DBREINDEX?

Best Regards,

Maheshwar Reddy