I haven't handled the Dealers yet, but the fact that it's a marked deck, having limited appeal for playing card games. I like the old-time look of the 216s, despite that they have a one-way back. But in the end, I pick the 216s, because of the unique physical properties of the paper and finish - they really are unlike any previous USPC deck to have come out of that factory in years, if ever. I know this puts me in the minority (at least at the moment), but it wouldn't be the first or last time that's happened!
Just out of curiosity, how many of you have tried the 216s? And how many have tried BOTH decks?