@Joe Nation,
I remember that Dys had strong opinions on which eggs were freshest and best but I'm by now confused on what he had said. What I sort of remember is that he preferred small AA eggs. Will have to check with Diane.
I use eggs mostly in baking ricotta tortes, less often making an omelet or scrambled eggs, and, lately, once in a while making gelato, and have recently worked my way up to extra large as a smart size for me. I can't remember the reason, but for some recipe - maybe homemade pasta - I was looking up egg sizing online. My store's/egg purveyor's eggs didn't fit the charts I looked up, and since then I've noticed they vary a lot, re the charts. Now my considered opinion based on hunch is that they have x number of containers to fill... and they use the eggs they have on hand.