Hello, Kevin,
Yes, usually Boot Camp-based virtual machines are considered to be better, than standalone, because of several reasons. For example, they do not require additional space on your Mac hard drive, which increases productivity and you can always recreate Boot Camp-based virtual machines without loosing the data.
If you really wish to delete your second "non-Boot Camp" machine, please, follow the Parallels Desktop documentation:
http://download.parallels.com/desktop/v4/docs/en/Parallels_Desktop_Users_Guide/23129.htm
Last edited by a moderator: Dec 22, 2008