I didn't like the Cokin/Lee style, although I know a lot of people enjoy it. I prefer 77mm screw-in filters for my RZ, which is the standard size on all the lenses. If I did more wide open landscapes, I might like the Cokins since you can position ND filters with great precision for sunsets/skies. However, when photographing architecture (my primary style), where the house/building is prominent, the ND filter is not much help due to the unique shape of the buildings in each composition.
Most of my filters are the B+W with couple Nikons in the mix - no point spending $500 on good glass to put a $12 eBay knockoff in front.