Which sold the most and the least. Just curious.
Probably anniversary was sold the most since it was included in ce. I like all the packs equally.
Yeah, probably Anniversary. It had a lot of old school favorites.
I liked anniversary over the others 
Speaking purely from personal experience I believe that Anniversary sold the best (counting those that got it with Halo: CEA). It seems that Anniversary maps show up more often than any other DLC in matchmaking.
As for what sold the worst, most likely Defiant. Fewer people buy DLC the older a game is. The only reason Anniversary seems to have bucked this trend is from being bundled with a “new” game.
Anniversary Definitely. I was nailing players left and right on all my favorite and best maps. Defiant and Noble however, were the worst. I hated them.
Anniversary probably sold the most.
Noble sold the least. The reason I didn’t say Defiant was because it had a Firefight map, which seems to attract those people who want to rank up fast.
Anniversary sold the most, and I loved the Noble Pack. Some of my favorite maps in the game
Opinion
Most: Anniversary
Least: Defiant