Difference between admin/normal accounts except the right to use "sudo"?

Question

This may sound stupid, but I wonder if there is any difference between normal and administrator user accounts (created with the Unity Control Center) except the right to use sudo to become root.

Answer 1

The big difference is in the amount of groups user belongs to. In addition to sudo , admin account has access to the following

xieerqi:$ groups xieerqi
xieerqi : xieerqi adm cdrom sudo dip plugdev lpadmin sambashare

That's pretty much what that settings menu in xfce does - adds an account to groups

By contrast , a regular user belongs only to his/her own group, unless otherwise changed by admin/root accounts.

xieerqi:$ groups tester 
tester : tester