Having stayed at both the ASSp and ASMu, I'd stay at the POR. The ASSP and ASMu are nice but they are VERY high energy!! The POR is so relaxing, plus you have 5 pools and access to the POFQ's pool too.
The All-stars only have food courts, no sit down restaurant and they have bus transportation only. The POR has Boatwrights restaurant, a food court and the boat to Downtown disney.
They really are 2 different worlds. If your using the room as a place to crash, do an All-Star. If you want to spend time at the resort then definitely do POR because they have recreation rentals, a fishing hole, 5 pools and access to all the POFQ stuff too.
Personally, I wouldn't stay at the ASSP or ASMu again but I would like to try out the Movies sometime, even though they don't usually offer AP discounts.