Anybody want a justifying setup talking about Evil Inc and end-of-the-fiscal-year closeouts and dozens of murdered Smurfs? Too bad, because I can’t be arsed.
Choose the fast-healing powers, and your immune system and recuperative powers improve by a factor of a hundred in both speed and efficiency. Just about any known infectious agent will die the second it touches you; a broken femur will heal in 20 hours instead of 12 weeks. It will even protect you against tumors, and your aging will be markedly slowed (though not stopped); let’s say you’ll age one week for every year. You don’t get any other physical improvements, though.
Choose to become a hyper-genius, and your intellect will obviously be hugely increased. Think immediate total recall (but voluntary–it takes an act of will to turn it on and keep it on) of anything you know, allowing you to call not merely raw facts but whatever sensory data you wish to consciousness at will. You’ll be a lightning calculator, able to solve complex mathematical equations in your head so quickly it’s not worth the effort of writing them down. That only works once you master the given bit of math, of course, but you can learn incredibly quickly as well; given the appropriate textbooks and a bit of quiet, you can replicate four years of college in an day, and master as many different subjects as you wish.
Both effects last sixty months. At the end of the five year period, you retain whatever benefits you garnered during that time, but lack the ability to replicate the raw feats. That is, any illnesses you were healed from stay gone, but your healing rate will return to normal; you’ll no longer have the immediate total recall or lightning calculator talents, but whatever subjects you learned stay in your nogging.
Which do you choose, and why?