Any, at all, and you're still you when you chose, you just have this heroes' powers
I definitely would be Martian Manhunter. The ability to shapeshift at will and to phase through solid objects, as well as being able to fly, reading minds and shit would be so helpful in life.
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Iron Man, Wolverine, or (if this even counts lol) Scorpion. Iron Man = get all the ladies, uber rich, awesome ass suit Wolverine = never die, metal bones (fuk yeah), strong/fast as hell. My costume would definatly be a ninja suit though lol Scorpion = can't die (specter status), GET OVER HERE, ninja powers