Why is it better to be a prole than a member of the outer party in Oceania?

Proles have greater freedom of thought and action.

Explanation:

The proles are the majority of the population of Oceania in the book 1984. The proles are the common people, and although they are still controlled by the Party, this has a much smaller effect on their lives. The proles have greater freedom of thought and action than the members of the outer party, who have to prove their allegiance to the Party constantly.

From: "Nineteen Eighty-Four"

It is better to be a prole than a member of the outer party in Oceania, because proles have greater freedom of thought and action.