This is a very personal question, as philosophy asks each individual to examine himself or herself and the world around them and then make a judgment based on what they personally believe. Deciding which philosophy makes the most sense depends, essentially, on what you think. Both have distinct merits. In order to help make you decision, I have summarized the two philosophies below.

Plato

One of the most famous philosophers of all time, he did a lot of thinking about what it means to live the best life. His ideas tended toward the idealistic, even toward utopia—which most agree is an impossible ideal. He was also comfortable with more abstract concepts. For example, when thinking about politics, Plato’s ideal is a kind of communal society of rulers who share everything and work together for the good of all. Only the best of all people would qualify as rulers, and these people would always behave with perfection. It is a beautiful, impossible, idea.

Aristotle

It is important to remember, first, that Aristotle was Plato's student for a long time. Therefore, his philosophy branches off from many of Plato's ideas. We can generally state that Aristotle was interested in keeping his ideas concrete based on how the real world works. For example, his idea of politics were not utopic at all. Aristotle acknowledges that monarchy easily devolves into tyranny, noble aristocracy falls into oligarchy, and therefore the only real choice—though it is messy indeed—is “polity,” which we call “democracy.”

If you prefer an idealistic worldview, seeking the best in everyone despite the uglier realities of the world, then Plato might speak more to you. However, if your ideas resonate more with the concrete and realistic, then you might find it easier to defend Aristotle’s views.