Quicksilver Vs Spotlight

Im trying to work out the difference between the spotlight search on the top menue bar and quicksiver. They both seem to do exactly the same thing. What is better about quicksilver than you cant do with spotlight?

Quicksilver does about a million things more than spotlight (though spotlight is nice)

QS can drill down into folders
QS can move folders or files anywhere you'd like
QS can copy/move/trash/etc files or folders
QS can search your Bookmarks
QS can set alarms to play a song or movie or open an application
QS can upload images to flickr
QS allows for triggers (keyboard shortcuts) to be applied to ANYTHING including Terminal commands
QS can open a current url with another browser
QS can send emails without even opening Mail
The list could go on and on....