Comment 2 for bug 107766

I haven't explicitly installed any system-config-printer (to my knowledge)
Yet I also find both items in the System -> Admin menu.

This is extra confusing because they are both different interfaces to the same thing.

About the old-style administration (like it was in previous versions of Ubuntu)
1) it now takes like half a minute or more to show the properties of a printer.
2) locally connected printer is now seen as a remote printer with usb://Samsung/ML-2010 as url

About the new-style administration (with the tree on the left)
1) it has better organized printer properties
2) it feels a bit more complex about sharing and stuff
3) it remembers and uses my options about economy mode, etc. (it didn't in the past)

About plug & play
1) It actually added the printer the moment I connected it. It didn't do this in the past.
2) I got a notification message with a big 'configure' button. This launched the new-style-admin.

There is now a default printer entry at System -> Preferences.

I think only one of the administrations should be installed by default.
Considering how much better the new administration works, I would vote for that.