Wow, that does look cool.

Boinc will be faster simply because it will utilize the full power of your cpus. Also, people have had problems losing progress after they shut the client down (ie 80% done, then shut down, restarted and back to 0%)

For the BOINC client go here: http://boinc.berkeley.edu/download.php

after the installation, input this as the project URL: http://www.worldcommunitygrid.org/
and then put in the username and password you already have.

Happy crunching and thanks again!