This was the million dollar question for our upcoming trip (we have a 4 year old and a 1 year old). We eventually decided on Art of Animation bc separate sleeping spaces for our kids will make everything easier. That being said, had we been able to swing a studio at the Poly, we would have done that - they are huge and our 4 year old could have slept on the pull down bed rather than the sofa, giving us more space. I would have put my 1 year old's pack n play in the bathroom by the door.
If you do choose a studio for your fam, I suggest a white noise machine for whichever kid is sleeping right next to the door so that the opening and closing doesn't wake him/her at every open or close.