The answer to your question: Are temporary workers employees or employers? Of course, they are employers not employees. We can call them temporary employees because they perform temporary work, get paid and that's it.
As for which is better, temporary work or a job, the answer varies from person to person. Some people are better suited to freelancing, while others are only suited to jobs. This depends on the individual's situation and skills. However, for me, I prefer freelancing to a job.