Most what? The pays are the same, all are done according to rank and tenure. And the rates are the same for the same ranks and time in service.
The perks are the same as well. All the services provide housing and food allowances. They also offer combat pay at the same rates. And they all reimburse at the same rates for travel and relocation.
The most obvious differentials are land, sea, and air. These are the main thrusts with the most people and equipment for the Army, Navy, and Air Force respectively. But, each one has groups whose missions fall outside those main ones.
Army has helos and they are in charge of inland waterway maintenance (strange as it might seem). Navy has it's aircraft carriers loaded with high performance jets. It also has the US Marine Corps, which is a land force. And Air Force has responsibility for the ICBMs aimed at Russia, Korea, and China.
But a more subtle differential, which can only be picked up by being in the military and seeing it, is management philosophy. In the Army and Air Force, they cannot do something unless their regulations explicitly say they can do it. But in the Navy they can do anything they choose to (within reason of course) unless their regulations explicitly say they can't do it.
You might want to read the previous paragraph again. It is really the answer to your question. The Navy gives its members the most discretionary authority. And that means more freedom to make important decisions and make a difference.
Retired Navy. OK, so I'm biased...so sue me.