Maybe I'm oversimplifying and this is not what you're going for, and if so I'm sorry, but the two moral issues are as follows, as I understand it.
When is a life considered a life? We agree in society that killing is wrong, what we don't agree on is if life begins at conception or birth.
The other is whether it is moral for a mother to take the "life" of her child while it is still inside her.
I don't know if there is a right answer. Killing is wrong, and a fetus is SOME version of life, and uuuuuuuusually the mother consented to the act that led to it.
But if you decide that killing is wrong, and a fetus is a life, what about mothers who might die during childbirth? What if she is a rape victim and had no control over her current circumstances? In my personal opinion the mother should be the first priority there, but I could be wrong.
Personally, I can't call myself pro-life or pro-choice, because I am a guy and could never fully understand the implications of having to make such a decision.
P.S. I am not a religous person so that holds no bearing on my opinion, as rambling as it is.