Rhodia is made by the same company as Claire Fontaine (Exacompta) and they're pretty much the exact same papers. The only real difference is the cover styles. CF is more of a student notebook; there's bright colors and designs. Rhodia is a little more grown up; all their covers are plain bright orange. Rhodia has only recently introduced spiral-bound books. The majority of their books are bound like a legal pad with a fold-back cover. CF has a wider variety of binding styles including sewn bindings. Both are available as plain paper, lined (4 lines per inch), or gridded (5 squares per inch). CF also has "french rule" which I don't really understand. I think it's a student thing with extra lines to establish letter proportions. Both are really excellent papers. They're as smooth as the Moleskine paper but much thicker -- no bleedthrough here.

(Can you tell I work in an art/office store? Sorry if that sounded like a sales pitch... but I really do love them.)