*ehkehum...*
okay, here goes,
Playing cards all mean and handle differently to different people, so there is no *best* deck out there as some posters after me will propably point out. There certainly are better quality cards - Bicycle Masters, for one, and although they are more expensive, they are also longer lasting.
If i'm not mistaken, Dan and Dave use Tally Ho's and Alladins, Arrco's and someties exclusive Jerry Nuggets. You will probably not be able to get you hands on Nugget's (unless you perform at macdonald's...ta dum, chiing!) and so will have to opt for the other ones. You are more than welcome to imitate Dan and Dave in the style of cards they use, but there are no guarantees that they will work as well for you as they do for him. Them.
Size of your hands, where you live, how vigourously you use them, these and amany more factor in towhich cards to buy. So there is no straight answer, as we tirelessly tell anyone who wishes to know
"what are the best tricks" or "which deck is better" and so on.
Thereby, I suggest you go to dananddave.com, and browse through their store, they sell 6 different decks there and they give you a lowdown on how they perform in their hands. Their hands, and not yours.
Ive said it once, and I'll say it again, decks are different. People are different. Buy a bunch of assorted decks and try them out for a while, search the internet for decks for flourishing (or read d&d's store tips) and finally come to a conclusion.
May the Luck be with you,
-Gus.