I'd go with the worst enemy. I mean, my best friend is awesome, but I'd rather have one person's life on my hands, not 7 billion minus one.
Death is merely a transition through which I would free my best friend from the earthly chains which bind his tortured soul and enable to soar into eternity where he can look down upon those left behind and say there, but for the grace of God, goes I.
****...that's messed up. I choose myself...the world can live without me.
Hard question.<br />
My enemy hates me. My best friend loves me.<br />
If I choose my enemy, one person dies and a great person.<br />
If I choose my best friend, then everyone dies, not a good thing in my book.<br />
I don't have an answer.