I have to go with Poly here as well based on the age of the kids. We stayed at Poly with my kids in May 2015 when they were 3 years and 10 months, respectively, and again in 2017 when they were 4 (almost 5) and 2.5 years, respectively. The easy one and easy off of the monorail with a stroller is imperative. We're headed back in October this year, and they will be 6.5 and 4.5 years, respectively, so we're considering moving away from monorail. That said, the bus service has gotten so unreliable that it may still be worth it.