These sister resorts allow pool hopping, so you can go to either one. We stayed at POR and hopped to the pool at FQ. We only stayed a few minutes. Our kids thought it was too "little kiddish". The slide is very tame at FQ, so it would probably be great for the 3-5 age group or a kids that's not so adventurous in the water.
Also, if you want the option of a quiet pool near your room, go for POR. FQ doesn't have quiet pools.