Everything will be loose in the Matsui. They are octagon-shaped barrels and can handle 43mm diameter chips with ease, and a bit of wiggle room in the barrel length to fit the most varied of
CC and ceramic chip thickness.
The Paulson and Unique, from what I've seen, are exactly the same. Unique manufactures to the Paulson standard (and even makes the branded racks for them, no?).
You should pick up a ChipCo if you're comparing all of them.
Just so you know, the Da Vinci and other cheap bulk acrylic racks on
Amazon and
eBay can also be used, but they have a VERY long barrel length and just about all chips will fit loosely in them. My most-worn Paulsons have fit 22 to a barrel in some cases for these cheaper racks.