A friend and I play 15 ball rotation three or four nights a week. We play call shot, one point per ball to 50 points, Any foul is ball in hand for the opponent. Whoever makes the 15 ball has the next break. We rack the one if front, two in the middle and three at the back canter. This makes it difficult to get a break and run, though it can be done. Great game, takes about one hour per game and we often play three games.
Playing to 50 points (balls) allows the opponent to recover when one player gets a couple of good runs. I like it better than any other game as it requires all skills including good defense.