If you are flipping the coin as part of a trick, it’s good to have a specific coin in mind. Not necessarily because it will make any difference, but because it gives you something to talk about as part of your misdirection.
On the other hand, if you are comfortable with the steps below, and can set the coin and get the toss off quickly, you can put the other person off guard, and maybe get a more favorable result.
Alternatively, you can also make sure you are the one tossing the coin. That way you’ll be able to control the conditions to give yourself an edge.
Take into account how the toss will end as well. If the tosser (you or the other person) is going to catch the coin and flip it over onto another surface (their hand, a table), then pick the side facing down. The extra flip after the coin lands will account for the difference. If you are the tosser, and want a little extra degree of sneakiness, you can judge the side of the coin by the feel. The “Tails” side usually has a more ornate design, so should feel rougher on your finger than “Heads. "
