The NAVY Seals definitely get paid more than the Delta Force. As the top black and special ops outfit in the Armed Forces, the Seals are simply considered the best of the best.
Doctor
Both receive generally the same amount of training. It's know that Green Team (which is the name of the training that SEAL Team 6/DEVGRU goes through) is about 10 months, and that's not including BUD/S and SQT(SEAL Qualification Training) that all SEALs must pass before becoming a DEVGRU operator. The number of months that Delta Force trainees must go through is unknown, it was 6 months when they started but I can guarantee that number has changed. Delta operators are also usually former Rangers or Green Berets, so both units have guys who have a lot of Special Forces experience already. A lot of people think that SEALs are in the Navy and that the Army SF units don't learn diving, not true. Delta has all the same capabilities that SEALs do. The simple difference between the two is that SEALs are usually more water based and Delta are usually more land based. SEALs are highly trained in VBSS (Visit Board Search and Seize) GOPLAT (Gas/Oil Platform) operations, Delta are highly trained in taking down planes. That's not to say that DEVGRU can't take down a plane or Delta can't take down a GOPLAT but that is there respective specialties. Even if DEVGRU or Delta had a few months more training that doesn't necessarily mean that one is "better" than the other. Both are the only 2 Tier 1 SF units the US have to offer and both are very, very good at their job.
Both Navy Seals and US Marine Force Recon are effective fighting forces, but they have different missions. Seals operate on a very small- unit individual mission basis, as their killing of Osama bin Laden demonstrated, while Marine Recon will scout a battlefield and destroy any key defenses prior to a Marine assault. Neither is 'better'; both are incredibly effective at what they do.
Their blubber gets thicker.
If your seals are going out, you are losing all you lubricating fluids for that part of the vehicle. If the leak gets really bad, you will have to have the seals replaced.
The force gets larger.
Yes it does. Delta gets 10% of your bill for the first year if it refers you to a dentist.
In general, the SEALS would be considered "better," as they are a special forces branch of the Navy. A generic "marine" soldier, while well trained, would not be on par with the most well trained of the Navy. The Marine Corps equivalent of the Navy SEALs would probably be the Marine Corps Forces Special Operations Command (MARSOC) but even they don't do the kinds of dangerous things that SEALs do.
Lea Goodrem. This is where she gets her middle name from! :)
The river delta.
The Coast Guard gets more training hours per man than any other branch of service.
the force is lift