From some rooms of the 90s building to the Main Building it is quite a hike.
I would book preferred because it is too far for a quick walk for a mug refill or getting a snack.
If POP non preferred rooms would be the only rooms on property left I would take them. The walk is a few minutes and can be very long in the heat, but other resorts have even longer distances to walk.
All in all I am not the biggest fan of the values, but some years ago we stayed in a preferred pool view at POP. It was noisy during the day, but the walk to the main building is not worth to mention. Just a few steps, very convenient!