2500 is right next to the pool and laundry room, so if you plan to use those facilities, it's perfect. It's also a very small loop so you can be in the back of the loop and have a quick walk to the front to the bus stop.
If you're renting a golf cart, then the size of the loop is irrelevant.
2800 looks close to the front, but it's still a bit of a walk to the front bus stop, and it's a longer ride to the Settlement for the boat to MK, Trail's End, etc.
We've stayed in 2500 twice and 2600 once. We would probably go to 2300 before backtracking to 2800.
Don't miss Wishes from the beach and the electrical water pageant at 9:45 every night. Grab a drink or a snack from Crockett's Tavern first lol. Or bring your own. Get the Giddyup and Go chicken bucket at least once for dinner too!
Enjoy.