I find a deep bench very helpful. I love having a solid backup at each position. I set my starters, one backup at each position, and then the starter as the 2nd backup. I get around 30 mins per game on my starters and 18 or so on my subs. So during the season Ill get a scrimmage and let the backups only play. That gets me 60-65 mins on each starter, 75-80 mins on each backup. I find that all 10 players end up with Strong to Proficient game shape by doing it this way. If I have my choice, I will always be 10 deep and run my lineups this way. If all of your players have good stamina it is really easy to run fast paced offenses and get the opponent's starters to tire faster. This gives you a huge advantage when the bench players have to come in. Most good teams are only 7-8 good players so if you can afford to be 10 deep you can always find ways to gain an advantage.