What would you choose?
For me it would have to be a teleport/transporter. Especially, something like the personal teleport seen in Dr Who, The Tomorrow People or Star Trek Discovery.
I would like to visit distant lands but get badly travel sick.
You realize a transporter would have to rip you apart atom by atom and then reconstruct you at the new location. Thus begging the question…is the reconstruction really you, or simply a duplicate made of the same configuration of atoms. Did you simply die and a new you with you same body and memories get reborn from the new atoms. How much of your original essence still exists, or was lost to entropy? Are you repeatedly vaporizing yourself and creating some imposter clone each time you Teleport?
The ship doesn’t care if it’s still “of Theseus”.
The thing is, the cells in your body are constantly dying and being replaced. So you are not 100% the same person you were even ten minutes ago.
Having said that there’s a short film on Dust that presents a different angle. (I must look it up). The people that are transported come back ‘changed’ because of the experience. It’s disturbing.
Teleport and transport would be amazing, but I’d be worried about ending up in some random location in outer space or like halfway through a boulder, or my duplicate would end up stranded on a deserted space station.
I’m going to pick the replicator. Food, parts, medicine, clothes, as long as the structure is on file, I can 3d print anything I need. And if I’m the only who has one, it’s basically infinite money as well. If everyone gets one, well at least we’ll solve world hunger. That’s better than being rich, I guess.
Just don’t ask where the protein for the protein synthesisers in Star Trek replicators comes from!
There are some items that would just be extremely OP, like the tardis or the infinity gauntlet