"The mistakes people make are eventually labeled as experience. But with a true mistake, there will be no experience to be gained. Because the mistake you made taking me as your opponent will leave you with no future." As said by Master Hades from Fairy Tail.
I really love this quote, it shows that the mistakes you make are considered experience which you learn from them. But with a true mistake, there is nothing to be gained. Just pure misfortune. If I had to choose, I would choose a mistake rather than a true mistake. We all make mistakes, whether be a not of a big deal mistake or a huge mistake. We all learn from them, and that gives us an advantage for the future as you know what to do when you're about to encounter said mistake again; you know the right choice. Life is all about learning and such. Live life to the fullest, nobody can stop you from that.