This pregnancy I have opted for a birth center. There were many reasons behind it, the most important is the fact that my 21 month old will be there with us as a family and we go home as a family a few hours after. I practice attachment parenting, meaning I breastfeed, baby wear, co sleep and I am a WFHM so I am with my son all the time. I did not feel it would be an easy transition in bringing a new baby home AND be away from mommy while she is in the hospital.
That is just one of the reasons. There are of course many reasons, as this is a very personal decision that was weighed out over the course of a few weeks, and after much research.