Adoption vs Abortion

[hoshi_reed]

There are some sites that say Adoption is emotionally damaging to the womans/mothers.

ex:
http://www.exiledmothers.com/index.html
http://www.amfor.net use to be known as abolishadoption
http://www.originscanada.org/index.html
http://www.keepyourbaby.com/

Which do you consider is worse to the mother and why?

Is there any studies on either? Does it matter/differ by country?

Would this change your opinion about adoption/abortion as "better" for the mother?