I would choose neither. If given the powers of destruction and death, I would surely become chaorrupted and use them for selfish, or evil, deeds. I also don't think that I would be able to handle killing all that I touch.
As for gaining the powers of healing... I wouldn't have a problem with losing my eyes. The real issue would be the expectations that others have of me. What happens if I'm not there to help someone? The people would blame me for the misfortune that has befallen them. I'd also be given the choice of whether or not I should save people. I mean, what if there's a person dying before me who has killed thousands of innocent people, and his family is standing there watching me. What would I do? If I save he, he'll probably just go back to killing people. If I kill him, I'll be called "evil" and I would become hated, and that's something that I'd like to avoid.
Basically, the powers, whichever path I choose, would become a burden for the rest of my life. I wouldn't choose either of the two. Instead, I'd rather continue what I'm doing right now. Who knows? Maybe I'm going to be a hero someday. Perhaps not in the way that I expect, but it could happen. I mean, there has to be a reason that I'm alive, right?