POR!! I went down it a million times when i was 11 when we went a few years ago. Honestly I think the POFQ slide is babyish. I went down a couple times and I was done.
Last year I took my sis on a trip without my family. She liked the looks of POFQ so we stayed there. However, one day we walked up to POR and spent 2 hours in the pool and on the slide. We are in our 40's and had a great time. I would not even consider going on the slide at FQ.
Also the water temp at PoR is usually much warmer too.