Parents can give children opportunities to learn about decision making. Encourage win-win negotiations. Most young children will need adult help in thinking through this process, and it does take time. The advantage is that after doing this process over and over, young children soon will become fairly good at identifying a problem and coming up with different options for solving the problem on their own. A child that has lots of practice in thinking of different ways to solve a problem is much more likely to solve a conflict in a positive way.
Parents compare children for a number of reasons.
Often, they believe that such comparisons will shame children and give them an incentive to do better. But comparing children to each other often sets them up for a great deal of jealousy and envy later on. It is generally better to avoid comparisons. Focus your words and actions specifically on each child's behavior. Correct or encourage children in a more positive way.