I'd rather live in the Fullmetal Alchemist universe.
Being able to do cool stuff by drawing fancy circles and pentagrams? Ye, that would be legit.
Plus, that's not just boring generic magic like other things, there's actual SCIENCE behind alchemy, with it's own laws and stuff, which makes it even better.
EDIT: Honestly, alot of stuff from like Star Trek and Mass Effect and Halo and Terminator isn't beyond the realm of possibility in reality, most of it's just advanced technology, nothing overly special. Something like FMA alchemy though, that's something that's never going to be a thing in reality, it's simply impossible, so it's worth living in a different reality.