To give this kid an actual answer...
The Marine Corps is small and relatively homogenous. The Army is big and is heterogenous.
For example, there aren't units in the Marine Corps that are really considered to be more prestigious than others. We only have three (active duty) divisions and air wings. While some units certainly consider themselves better than others or have slightly better/worse reputations, it's different from the Army and those reputations are at the battalion/squadron level. Theres no 82nd or 10th Mountain in the Marine Corps. The only reason a guy would be butthurt going to 7th Marines vs. 1st Marines is because he (rightfully) doesn't want to live in 29 Palms.
Also, the armored side of the Marines is much smaller: a couple tank battalions and a couple light armored reconnaissance battalions. Most infantry units are light.
Same thing on the air side. All pilots are commissioned and come up together through the same pipeline. If I thought about it, I could probably name someone I know in every helo squadron in the Marine Corps and most of the fixed wing units. And, similar to the ground side, every one type of squadron is relatively comparable to another. Every 53 squadron has roughly the same capabilities as any other 53 squadron, etc.