My usual answer to this question is "The card you want the foil on" - which may seem unhelpful, but here I show you why this is my answer. I find that nearly all smooth card and paper I try out can be foiled so long as the number of card shims used is right - this can take some experimentation to work out, and results can also vary with the hot foil plate, and the foil used.
Generally hot foil stamps (plates) with fine lines need less pressure than those with broader lines or large solid foiling areas.

You can't heat your hot foil stamps for too long. They can only get as hot as the temperature of the hot plate (whatever system you are using), and that is the optimum temperature for foiling. Heating them for a longer time does not cause "over foiling". Over foiling happens when you have too much pressure (too many shims) or if your card and foil have been on the hot foil stamp for too long and the card has also heated all over, rather than just where the raised area of the hot foil stamp is - the foil can then easily adhere to the heated card.

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