Okay, here's the stipulations.
Science/Technology: If you choose this you automatically can live in any world you choose that heavily features this. You become a genius in the fields of chemistry, physics, mechanics and engineering. You will also have resources at your disposal to build whatever you'd like for either personal gain or to help the world.
Magic: Again, you can live in any world that features magic from any book, film, show or animation. You are naturally skilled at potions, spellcasting, astral projection, etc. You have all the books and/or supplies you need to conduct your magics.
Which do you choose??