Don't rely on buses. Get a golf cart or sit around miserable waiting on buses that go 10 mph...
As others pointed out, size, but I believe most are closer to the 'settlement' and waterfront.
Honestly nothing that you are going to miss. Unless you have a very large rig you were not going to notice a difference in the two. And like stated before there are a lot of internal buses so walking is a minimum pretty much no matter where your spot is
Concrete slab closer to amenities and easier to maneuver around location. That being said the campground is very big and there are buses all over to move campers around.
Premium is a full concrete slab, and a little bigger site which makes it a little easier to maneuver your camper into, location and mostly price!
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