We picked POFQ (our kids are 6,4 and 3 mo.) because we thought it would be the best fit for a young family. The bus situation seems simpler...one stop, hopefully less crowded (based on reviews), etc. Since we have a double stroller, that is something we value, as we noticed that it was tricky taking two kids and a double on the crowded POP bus last year.
The resort is smaller than the other mods, so less complicated that way. When we are there, I know that there will be some back and forth to the room. (We got locked out of our room because of some kind of key/lock error five out of the seven days that we were at POP, and the back and forth drove us crazy).
The food court sounded pretty good...we are only doing on TS meal...with the little ones, CS is the way to go for us. Their food court seemed better and less expensive than at least one of the other mods.
When looking at pics, my kids really liked the look of the pool. I think CBR and CSR looked a little intimidating to them. We are hoping to walk over and use the one at POR, which you can do if you stay at POR. I've also read that POR's food court is very good, so we will be trying that as well.
The boat to DTD is a huge plus. Also, I know my kids will love watching the carriages go by.
If the mods don't end up being in the budget, my kids really liked POP. The buses come through a lot...we only had one really long wait to DTD one night. (They are crowded though, and we did not often get a seat). They food court is really nice, with lots of options. Since your kids are so young, you will probably really like their pool options. They have a kid splash area, another area that has the fountains, and then the pools which are fun. When my kids were at the 2/3 age range though, they were much more interested in the splash areas than the actual pools. They also really liked the icons, although I think they would have enjoyed the icons at ASMo even more.
Good luck deciding!