Whether the Marines are harder than the Army is a difficult question to answer because both branches of the military have their own unique challenges. In general, the Marine Corps is often seen as the more challenging branch due to its rigorous physical and mental demands. However, both branches are equally challenging and require a great deal of dedication and hard work.
When it comes to physical requirements, the Marines have a much higher physical fitness requirement than the Navy. Marines must be able to pass a very rigorous physical fitness test, while Navy personnel must pass a basic physical fitness test. The same is true when it comes to training. Marines are required to go through a much longer and more intense training program than the Navy. This includes basic training, advanced individual training, and specialized skill sets related to their job.
Serving as a Marine means that you're also more likely to be sent into dangerous conditions. For example, when it comes to combat, Marines are expected to be able to deploy into combat zones and fight on the front lines. The Navy, on the other hand, is primarily focused on support roles and does not typically deploy into combat zones. For their extra action, Marines do typically have shorter deployments than Navy personnel, but they can be deployed for much longer periods of time.
In terms of living conditions, marines often have to live in much harsher conditions than Navy personnel, such as living in tents or other temporary shelters. For their extra suffering, Marines also have more opportunities for promotion than Navy personnel, as they are often given more responsibility and leadership roles. Marines also typically have more generous benefits than Navy personnel, such as housing allowances and educational benefits.