When i was reading the book i was thinking about this question. Personally i would choose the cloak cause ur invisible and can do whatever you want and get away with it. But then again in the world we live in wtf is the point of a elder wand. The ressurection stone is pretty awsome except that the dead come out weird, it would be good if they came back untouched and just like they were before they died. If i was harry i would probably choose either. The wand to own any death eater, and kill bellatrix!! The stone to bring back his parents, dumbledore and sirius. The cloak because he's a wanted man and because it's just pretty awesome lol, they all have their ups and downs!