PORS would give you a trundle bed for your 2 y/o. It also has the nicest food court of the moderates and the boat to DTD which we love. It has Ye Haw Bob in the lounge which your kids would love. It's a beautiful, very shady tranquil resort. Some people love the mansions, but we personally prefer the rustic look of the Bayou buildings. Both are lovely though. There are ducks, lizards, and squirrels everywhere at this resort that your kids might enjoy.
POFQ is my favorite moderate, because it is so small that no room is very far from the main building or food court. It also has the boat to DTD. Your two smallest kids would love the dragon slide, but your oldest might consider it a little lame. However, because POFQ and PORS are sister resorts you can legally use the pools at either resort. It's a beautiful walk along the river. POFQ shares buses with PORS, but the FQ is usually the first pick up and drop off, so you should always be able to get a seat on the bus. The one thing POFQ does not have is a TS restaurant. They do have a very nice jazz player that plays certain nights in their lounge.
CBR has the pirate rooms (preferred price though and quite a long way from the food court). It also has the recently remodeled pool, which inlcudes a very nice kiddy area. However, it is my least favorite moderate. It's a pretty resort, but HUGE! I'm giving it another chance next Sept, but the last time I was there the bus system was horrible, housekeeping was really bad, the food court was the worst I've ever seen at a WDW resort, and I got extremely ill the one night I ate at their TS restaurant (Shutters). I have never stood on a bus as many times as I did that week, there was a pair of men's underwear on the floor of the bathroom when I checked in, my room got completely missed by housekeeping two days that I was there, and one night I arrived back to my room late to find my door had been left propped open by a trash can all day. When I called security to go into the room with me, they just blew it off, saying the housekeeper had apparently been cleaning several rooms at the same time and just forgot she left my door propped open.

Oh, yeah CBR is the only moderate that does not have elevators, so if you get on the top floor you may be carrying strollers and little ones up stairs several times a day. I knew this so requested a bottom floor, but did not get it. Anyway, my point is, that I was not at all impressed with CBR. This was about 2 years ago.
Just FYI: As you can see from my counters, I prefer the moderates over the Values and even the Deluxes. I have stayed at all four moderates and since I go several times a year try to trade out among them. I would rank them: #1. POFQ, #2. & #3. a very close tie between CSR and PORS, and #4. CBR (and that's a very distant 4th).