Why is Naval Infantry stronger than Army Infantry?

I love these questions! Its like trying to say which Spec Ops is better when they all have a slightly different reason for existing. The Army is bigger therefore needs more people and has a bigger pool of people to pull from for its more elite units such as Airborne, Spec Ops, or Special Forces. The Marines are smaller. They are intended to protect ships and make amphibious aults as well as land operations now a days. They do not need large standing forces such as the Army which is the main land force. Thus they have a unique role in both Naval and land warfare which doesnt require nor can support as large an organization as the Army. Due to this, they can recruit and have more stringent conditions. The Army needs a lot of people in different roles to support itself. Not every soldier is going to be a 300+ PT stud. The Army does airborne ops behind enemy lines which you need to be physically fit to do. It comes down to size and purpose. (Navy also has to support all those troops via support personnel) In reality, their basic training is only harder but their everyday operation tempo is just like a normal active duty Army Infantry unit. I think its good though that they have higher requirements for their soldiers. And I think we all believe our branch is the best branch out of all of them...LOL. Its good for espirit de Corp and camaraderie. Most of us believe that just for something to do while a small majority of those who are not objective or civilians who know little about the military actually believe one is better than the other. At the end, I would have no problem fighting beside Marines.