Well a Mattebox is going to allow you to have 'Stages'. Could be 2, 3, 4, (A stage is how many filters at one time can be used)
One of these stages should be 'Rotating' for Polarizers or Grads.
Some Matteboxes come with a French Flag option which is nice if you can get away with not using C-stands and the Mattebox French Flag works for that shot.
If you are going to ever use 2 Filters at once, you will need a Mattebox.
well I was comparing the century to the chrosziel. So the century is quite a bit cheaper. I don't have an anamorphic adapter so i don't need the chrosziel....