We've stayed at all the mods multiple times. POFQ is our favorite, mostly for its compact size, but we also like the theme and the DS boat. All of the other mods are huge by comparison.
We only stay at CSR if we can get Business Class. While the theming doesn't wow me, personally, the main pool is very good, and because of the convention center, the resort has more TS and bar options than the other mods.
CBR is our second favorite mod. We love the theming, and it has been recently refurbed. While it is very large, we've always requested and gotten rooms in either Jamaica or Aruba, a relatively short walk across the bridge.
POR is our least favorite mod. I'm not a fan of the theming or how far some of the buildings are from the main facilities. But many consider this their home resort. We only go here now with a preferred room.