My take has always been would you rather end an unborn child's life, or have it be born into a world where their parents dontwant them. Death, or the ruining of two/threelives. I find that to be a pretty easy question to answer.
(Just realized this isn't about if abortion should be done or not)
To add, more on the topic, it's the mothers choice because 1. She's the one growing it 2. That birth and life will effect her more so than anyone else involved