Here are the Copags. Interestingly, the cards that I had discoloration issues were multiple decks of Copags, and only blue decks. I wonder if they discovered a blue ink issue back in the day and if it's fixed now.
Next are Modianos. Really felt thick and stiff back in the day.
Not many Da Vinci's, but I liked the cards.
Dal Negros were some of my all-time favorites. I used to use the brown/green poker size setup often.
The NTP cards, I think they were called "Floreale," were amazing. Might have been my favorite deck to deal with.
Desjgn early cards (2005?).
Gemaco cards were great, and held up really well, but I only ever acquired these four decks, all World Poker Exchange labeled. Two of the purple decks are still sealed, and the greenish one is from the London Open 2005.
Piatnik were always highly rated, and I loved the only deck I had by them. Also, some bridge Graphicas.
Kems almost always bowed over time. I have a lot of older setups, and they are almost all bowed to some degree. I really love the Binions poker size deck.
Last two... some junk cards (Royals and Vegas) which are slick and flimsy. Sounds like that hasn't changed. I also wish more companies included branded cut cards with their decks.