There are some variables that may affect which loops are best, and it's all up to what one prefers and what things are more important. I stay in the cabins usually once a year, sometimes twice, so I'll explain my personal choices and why it works for me.
I generally request 2800 loop, will accept 2700 loop, or 2500 loop - all requests are specific that I want 'back of loop, outside'. By back of loop, I mean farthest from the main road - because those cabins tend to back up to wooded areas vs other cabins. Outside of loop again means your against forest, rather than the inside cabins which look across to the other side of the loop. In 2800 loop, any of the cabins from about 2810 are OK as there's no loop on that side, but once you get past the cabins around the back of the loop, the cabins back up against he 2700 loop. I just like feeling more like I'm in woods, and seeing wildlife out the back window rather than other cabins.
I don't use the pool facilities at all, so proximity to that isn't important to me. Also, I generally am on 4-5 day stays, so laundry isn't needed. I always rent a golf cart, so internal bus service isn't something I need or use - I honestly don't know if I would even want to stay in the cabins without a golf cart - it just makes getting around so much more relaxing and convenient - I don't mind being at the back of a long loop, and I can ride to Outpost or Settlement on the cart as needed to get around to the parks and busses...and can hit the stores or pop over to the restaurants for food anytime.
I'd say for those to whom pool, laundry, or bus proximity is important, 2500 and 2700 loops are probably best, being closest to the pool - I'd probably avoid the first 5 cabins or last 5 cabins in the loops, as those are too close to the main road and busses so can be a little noisier - but if you don't have a cart, you might not want to be all the way at the back of a loop, at least the big ones like 2800 and 2700.
The walk from 2800 loop to the Outpost bus stop is about 7-8 minutes at a normal pace and there are sidewalks the whole way. I only know that from checkout day, when I bring the golf cart back to Outpost and walk back to the cabin.