Generally, full-time jobs are more demanding. As a full-time employee, you spend more time working daily. You also work the same number of hours five times a week, and there are cases where you work overtime. Additionally, full-time roles attract more tasks that are central to the company.
Part-time employees, on the other hand, work fewer hours and have more flexible schedules. This accounts for why full-time employment comes with more compensation packages and also has more job security. Companies generally spend more on retaining full-time employees than part-time workers.