Things are not cared for in Plato's state. Because everything is seen as communal and people do not take care of them willingly.
Aristotle states that you need to let people have their own things so that they can learn how to take care of them. People are more careful with their own things.
Plato states because everything is communal, that everyone has ownership of it. We learn at a young age to take care of things.
Aristotle claims that Plato's city will not be a happy one because they do not have the ability to own their own property.
Aristotle states that people will feel that they do not need to work hard because they will not be benefiting from a job well done by receiving their own possessions.
Plato states that there is one goal in life which is that everyone does their part in the city. Workers and warriors feel rewarded by working hard because what they are doing is what's best for the city. The motivation of the rulers is to understand the Forms so that they can rule better (intellectual satisfaction and being able to see clearly is their reward and makes them work harder).
The virtue of sharing will not exist in Plato's state thus removing the primary way in which people create bonds and friendships.
Aristotle claims that you need to have things to share with people in order to create such bonds with people.
Plato states that there will be sharing, the sharing of thoughts and ideas.