It is tough to choose which marked cards you will use. Will it be the brand that gets you or will it be the design on the back. One thing is for sure. You cannot buy the cheap dollar store marked playing cards. The marked cards must be professional and have the special material that most cards are made of. You can feel the back of the cards to tell if they are the right ones. If it is smooth and no grooves are felt then the cards are cheap and cannot be used. If the card has grooves and feels real then they can be used.
After you choose your preferred design, choose your brand. Usually brands will have a special design,so the questions intertwine in a way that they most likely will be answered together. Once you have your favorite always pick this type of card so that there are no differences.