I have always used post. I actually never looked into D ring before (truthfully i didnt even know they made them) but there are some valid points here. maybe i should look into this. My 11 year old has 2 books that are full (and i am actually 7 years behind on his book) they are both orange leather post bound. since i will be adding any new pages to yet another book maybe this is something i should look into if i can find orange books (he loves orange)