Peak human potential vs superpower of choice.
Each has a bonus which in entirely optional. Each cures any diseases or injuries one has, with the exception of ones you want to possess (e.g. my Asperger's Syndrome).
Peak human potential:All physical stats are peak human, you are always fit. Perfected traits include strength, speed, intelligence, beauty (your standards) and any others one can think of.
Bonus:
You can alter your aging process, including stopping it.
Superpower:Any power from this site you want, with secondary powers included.
Bonus:
Gain a superhumans physique; for males, automatic muscle tone, for females, it is
most common superpower. This can be adjusted to any degree.
I would go for the
superpower, as many here would. I would not have the bonus though; I like my scrawny, muscle-free frame.