Scifi, Wizard or street smarts

All three choices come with a x2 upgrade to all aspects of your brain, plus curing any issues you may have with it. All choices give you a guarantee to master the chosen field within one lifetime, but you start basic and learn as fast as your dedication.
In addition you have no trouble accepting life changing revelations and cosmic horrors.

You only know what exactly is possible with each choice after making it.

Scifi:
You turn into the smartest man, and instantly hold knowledge of all stereotypical science fiction uh, science.
And their blueprints, and every step in between. You'll know the materials you need, and what to do with them. But getting people to believe and help you, and getting money is up to you.

Wizard:
You are the sole user of magic. You suddenly have a vast library of spells, potion recipes and miscelanious books memorised in your head. You need to learn how to use the magic in practise, and start with basic spells like sparks and minor telekinesis.
In addition, you may seek out existing books on magic and superstition, and try to prove them right or wrong. Most medieval ones like where to find dragons will be real, most random fiction won't but some of them will be.
Also, you get an outfit and staff of your choosing that will never break or get dirty.

Street smarts:
You embody everything that is possible today, or has been possible (except for forgotten magic or science)
That includes knowledge on perfect morals, buisness decisions, not being bored, an uberman sleep schedule, living a long and healthy live, super espionage, dealing with dangerous situations, surviving with empty pockets in most enviroments, preventing dementia, magic tricks, etc.
You won't be an olympian right away but you'll be able to succeed in any existing training.

After surviving (or thriving, king ;) 150 years you get to pick again without loosing acces to your old powers or knowledge.

Bonus hypothetical: You can choose first but two random people somewhere on earth will get the other powers. You can still get more after 150 years and you don't need to be enemies but you could be.