I've never stayed at Planet Hollywood, although I would, their rooms seem very nice!
Plant Hollywood has gone through some changes since I have lived here, mostly on the facade. From being the front of the extinct Aladdin, to Plant Hollywood to the addition of the Harmon corner. It's modern looking and to some an amazing sight. To me it's ok, it's nice and all but I'm just not overly impressed.
I do like the finished off look they've given the Harmon corner, adding Twin Peaks and a Bubba's. Anything Vegas can do to make it not seem grimy and trashy. They don't have any 'can't miss' restaurants, Koi is ok. I ate there several years ago and I would go back but that's about it. I've seen Peepshow with Holly and recently Meatloaf in the smaller theatre upstairs, it's good and really not a bad seat in the house. I've also seen Journey in the other larger theatre and we sat high up but the seats weren't awful so for those things. It's cool!