While I"m looking for the distance in walk to the park and room size, all my kids care about is the pool and water slide.
Then you're looking at the DLH.
We had the second most obnoxious room at the Grand. It was literally as long to get to the center of the esplanade from our room as it would have been from the sidewalk outside HoJo. The one day DH and DS thought "oh let's zip down to Grizzly, get drenched, then zip back to change", by the time they got back to the room they were turning blue, because it was such a long walk through air conditioned hallways.
The Grand's rooms are the smallest (unless you're at a villa of course) and they are dark and gloomy.
Thanks to a recent long stay at DLH, where I actually liked it, I'm now tied between PPH (which had been my fave since December 2007) and DLH.
PPH has, in general, the biggest rooms, and they are BRIGHT and cheerful and fun. You ignore their signage to the parks (their signs take you out the back, through parking lots, around and through ALL of DTD) and just go out the front, then cross the street and go through the Grand. The lobby of the Grand is open to all and is the best part of the Grand, in my family's opinion. So walking through the lobby is pleasant, when you've come from the big bright cheerful rooms of PPH.
The slide at PPH's pool area doesn't go into the pool, but ends in a shallow thing of water. I've never actually been on it, so i can't say if it's fun or not. But it eliminates any issues of weaker swimmers, or kids not understanding that they need to swim out of the way. They just get up and walk out of the way.
DLH's room makeover is very nice. I became quite fond of the fireworks in the headboard and the "dream is a wish your heart makes" music when you turn the "fireworks" on. I want to do it at home, now.

The rooms were nice, the housekeeper were sweet, and the pool was quite pleasant. DH and DS like their slide. Guess I haven't been on any slide at Disneyland...I reserve my pool slide for WDW's Boardwalk "clown" pool, it seems!
We were in Frontier tower, which is the furthest away, and I've realized (with the help of mapmyrun) that there are two good ways to go, both of which are the same distance to the center of the esplanade (that's just the measurement I use). You can walk through the grounds to the start of DTD and walk on through, or you can go out the BACK of Frontier tower, go towards PPH, and cross over to the Grand and follow their path out...same distance. Ooh now I need to map the walk as if I'm using the Grand's entrance to DCA; we only did that once, though, because going through the main entrance for EMH is a better idea than the entrance to DCA from the Grand.
For me, it's now between PPH and DLH. The Grand is a distant option for us. If we got a villa it might be different, but since we don't own DVC at the Grand it's probably not going to be possible.