I’m in the midst of writing a new, small, fast role-playing game with a very specific purpose in mind. It’s going to be based around rolling just one die, but I must decide which die to use.
Currently, I’m deciding between a d10 and a d20. A d10 will make things even faster and easier and it’s perhaps slightly more unique than using a d20, but it would also give a narrower range of results and be less flexible. A d20 is more ubiquitous, but people still really like using a d20, and it would give a wider range of results and add more flexibility.