I started off in this card business pretty recently with Theory11. I still think the Sentinels are gorgeous, just love the design, but if I look at my stack of decks and which ones handle the best, I think I have to go with Ellusionist. The Artifice, Tally Ho Vipers and Arcanes just work amazing for me. I only have one D&D deck, Fantastique and those handle nicely but tend to get slightly more bendy than the Ellusionist cards.
Luckily, we have so many awesome choices these days with so many cool projects, especially from the small guys like Vortex, Seasons, Mana, Actuators etc. The big dogs are going to have to step it up to stay at the top.