Android technology for sure. I'd nuke various places in the world and make myself the immortal king.
Before or after unmedicated but actually medicated mass rape.
Wtf. That was meant to be the troll option.
I'd say capsules would be super useful for personal storage at home and you could travel without hotels. They could make world trade so much cheaper and quicker too - one ship or aeroplane could carry a million capsules, with each one containing a bunch of shipping containers. Probably the most useful for the world. If just I had the technology, then outside of saving space and some costs, I'm not sure it's so great - can't think of a way of getting rich from it, aside from selling the technology. I guess you could steal planes or something to sell to other companies/militaries, pretty risky and hard to plan though, getting involved in dodgy dealings like that. You could just clear out games top's warehouse instead. This is the one I always thought would be coolest.
Time travel would be not super useful day-to-day I imagine, since it requires so such time to get ready (unless that was just due to poor logistics in the ruined future), so it couldn't be used for small things like correcting crimes, but could be used for preventing wars or something. If just I had it, obviously I could go back and win gambling over and over, unless the past changes too much. I'm assuming you can only go back from the point of the machine being invented, not forwards.
Personal immortality could be an experiment that goes wrong, like it might be super depressing after a while. For the world I guess it could make the planet smarter through increased learning time, but it might just be concentrated in the hands of militaries and loser sociopaths or something and then it would be a clusterfuck.