We only do preferred at POR. The resort is huge, we previously....we were placed in the rear in what felt like another land mass literally. The walk was ages, the buses were already filled up when they got to the stop, the walk to the ok main island was far. No one wanted to walk a mile to go grab a soda refill, or walk the gift shop, or the bar ( dh)
I like bldg 14 best, though 18 is also good.
Staying very close to South Depot ( 1st stop) , restaurant, indoor bar, main pool, great food court is all worth it to us.
When we stay moderate, we enjoy POR preferred.
Totally worth it to me.