Specter Flux
Are we assuming here that we all have some kind of innate ability to actually use these magical items? Because what is useful to a wizard is drastically different from what would be useful to a Muggle.
I actually was going to ask this about the potions answer. Knowing the instructions means nothing if the magical properties of the ingredients aren't existent as muggles.
And a stick means nothing if it doesn't work right either.
I guess it would have to be more "which magical object do you wish was real?"
In which case, still wand.