I love POR, but I love the WL a whole lot more. Given the choice I'd take the WL.
I have to say, POR is a wonderful resort. The theming is incredible, the pools are nice, there are great recreation options including a nice playground for the kids, the boat to DTD is nice, nice restaurant, great food court.......there is a lot to like. IMHO it is the best of all the moderate resorts.
That being said, the WL is just more of a deluxe experience. The rooms are nicer, with indoor corridors off an incredible lobby. The theming is just incredible. The grounds are beautiful, including the water falls leading to the main pool and the guyser, the pools are wonderful, a nice playground on the beach, activities for the kids......it is great. While you do have nicer restaurants, the one thing you don't have is an elaborate food court. Roaring Forks is decent for a quick bite, but it is nothing like the food court at POR and I have friends who prefer the moderate resorts just for that reason. As for transportation, the boat to the MK is wonderful. Having direct access to a park like that is great. Can't comment on the busses, as we always drive everywhere except the MK when we stay at the WL. Not that the transportation is bad, we just aren't big fans of buses.
All in all, we have found the WL to be the most relaxing resort on property. You have a great location, yet the atmosphere and theming make you feel like you are a million miles away. So, while POR is great, I have to go with the WL.