My question would be - will you use Early Entry? If you would use it - then go for the PPH. If you're not going to take advantage of EE, then BWPPI is certainly a closer walk.
Other reasons for the BWPPI:
Free breakfast. Although I never used it, I know they have one.
You are outside the Disney bubble and have closer access to restaurants on Harbor Blvd.
Other reasons for PPH:
You are in the Disney bubble -and feel part of the magic 24 hours a day.
Waterslides
The weather will be warm enough to swim, and the pool at PPH is better than the pool at BWPPI.
Even though you may have a standard room at PPH, it never hurts to request a DCA view. It is fabulous! If your little ones won't stay up for WOC, you can see it from your room (if you get a high enough floor)
Personally, I like the PPH room décor better. BWPPI seemed very dark to me.
Easy access to Surf's Up character breakfast - one of the better ones, IMHO.
All things being equal, I would choose PPH in a heartbeat since we use EE every opportunity we get.