maybe I'd pick smell
I have such a strong sense of smell that little things actually smell a lot worse to me

example: I could be out walking after a rainstorm, and the after smell could give me a headache, even though to most people it's quite comforting. I've smelled some really gross things over the years, so I don't think it would be missed too much.

which would you choose. an extra arm, or an extra leg..