It'd depend on whether the wand came with magical knowledge as well. I mean, if so, that's the one I'd take - it would be the most powerful single artifact in the history of our world as well as the Wizarding one. If it doesn't, it's just a wand, I guess I could sell it to a theater or something? So then I'd take the cloak.

I could see powerful uses for the stone if it lets you summon anyone dead or command the dead to reply to your questions and stuff, but I don't recall if it can do either.

Cloak is most reliable, obviously.