We went to both pools during our 2007 POR trip..
Now neither pool slide is a ride or such like that. Just so folks understand.
The POR one was longer and say if you were a kid under 10 or so, it was better..
FQ was nice, shorter though and a tad tamer. Tame is relative and both slides are slow and great for younger kids.
Our kids are 9 and 7 and did a few trips but had more fun with the general pool area and the water spouts and such then the rides.
After a full day at Typhoon Lagoon, the resort pools just did not have a thrill for them
But if you have a kid under 5, I vote FQ. That one seemed to have more appeal.
Granted I did not ride the FQ one. But I did give POR a spin