SQL-Server Performance: What is faster, a stored procedure or a view?

Question

What is faster in SQL Server 2005/2008, a Stored Procedure or a View?

EDIT: As many of you pointed out, I am being too vague. Let me attempt to

Answer 1

I believe that another way of thinking would be to use stored procedures to select the views. This will make your architecture a loosely coupled system. If you decide to change the schema in the future, you won't have to worry 'so' much that it will break the front end.

I guess what I'm saying is instead of sp vs views, think sp and views :)