So, here's the question. Does it take the same goal to satisfy the management and the drivers or do they expect things that would contradict eachother? [...]
It all depends on the people; some managers are different, some drivers are different. Based on my own brief experience with this company (1.5 years at this point), I think there is a lot of wisdom contained in air_dr's post #7.
As far as the general goals of management, though, it is to get the most work out of you as possible; so, let us suppose you do 200pph very easily, and are standing around at times with nothing to do; if it is feasible, you will quickly find yourself with 250pph, then 300pph, until they/you find your maximum. As pointed out previously, though, there is a balance between safety, speed, and load quality; and, in my experience, one or two of those three things gets sacrificed for the sake of the remaining one.
For the drivers, their interest is in having things in the proper spot with no misloads or bad PAL's; they have a hard enough time without shagging misloads around. But, again, in my experience, expectations vary: for example, somes routes in the center where I am employed are hammered front to back, floor to ceiling, without fail; the drivers do the air and then go to do one bulk stop because otherwise, they cannot move inside the truck. For the tight residential routes, however, the expectations are different.
Talk to the drivers you load for, and learn what they want; as yet another example, there are some routes where the drivers want an address loaded in the same spot, every day, regardless of what the PAL says.
[..] If so, which one should I satisfy for my own best interest?
What is your best interest, though? Is it management, corporate, driver, etc? As mentioned previously, you should concentrate on learning how to properly load several cars, and observe; also, depending on where you want to go, maybe ask some questions - try and figure out the entire process of a parcel being ordered up to it being delivered; when you account for the technology involved, it is so far beyond just picking up a package and then dropping it off, that it is almost beautiful at times.