Selenium Grid 2 or Hudson with slave nodes?

I can run my tests on the Hudson CI, but I was interested to know if there is a clear difference in performance between the Selenium Grid 2 and the Hudson CI working with slaves.

I still need to get xvfb to work with Selenium Grid 2, while Hudson CI is built in with the ability to start the XVNC server for each test ....

I would stick with Hudson CI, but are there any clear advantages to using Selenium Grid 2? My tests are already written in Webdriver.