We stayed at DLH for the first time last November. I really liked it. We had a standard room in the Adventure Tower that had a really nice view of the fireworks. Albeit they were far away, but we watched them from our bed the first night. It was really magical feeling
We also really liked being so close to Trader Sam's. Tangaroa Terrace was being remodeled at the time, so we didn't experience that. We did go to the lounge at Steakhouse 55 though and DH fell in love. He says he wishes he could transplant that lounge in our hometown. He really likes the classy retro vibe.My only gripe about DLH is I love a REALLY hot shower. The water temperature was definitely not warm enough for me. But that just may be my craziness
I've stayed at PPH ages ago, but from what I remember it was a really nice sized room. The walk isn't much further, but it felt slightly more removed from the bubble than DLH.
Either way I think you'll have a great trip! EMH is awesome... particularly at DCA since it's limited to hotel guests.