We stayed at DL hotel in 2014 and PP last month. We are going again next year and are hoping to go back to DH for what it's worth. The hotel at DH seems more updated, more Mickey atmosphere, and it seemed more inside the Mickey "bubble" as you weren't crossing a street to get to the park.
I know to most people a room is just a place to sleep, but with 3 little ones proximity is important to us. We had to go back to the room several times, to change clothes, take a break etc and it was SO worth it to us. If it were me like I said I would choose DH I don't think PP is much different proximity wise, but it seemed a bit further. Like I said DH seemed more inside the "bubble" as its pretty much in downtown Disney. When we visit we like to feel immersed in Disney. So not seeing cars, traffic lights, buildings etc is important to us. The less we see of the outside world the better it is IMO