Riverside for me too. Although it is much larger (which may be an issue) there is also so much more there, and the diversity of landscaping and theming are wonderful, especially in the Alligator Bayou section. Pluses include better & more pools, bike/boat rental, horse-drawn carriage rides, fishing hole, pirate adventure cruise for the kids, two restaurants (a bigger food court plus a table-service location)
Don't get me wrong though, POFQ is lovely too, it's smaller and more quaintly laid out - and after all, it's only a 10 minute walk over to Riverside to get all those extra facilities if you want them.
Basically, whichever you go for you'll have a great time!
Andre