Coming from a complete birth background and not understanding the situation completely, I would say one is better from the perspective that you have more hurdles during pregnancy and birth with twins. More policy being shoved down your throat, more c/s which of course means more risk and likely more monitoring and all that (which you can say no to of course) but you have more challenges. I understand actually getting pregnant is the main thing here and I am completely sensitive to that, just thought I would throw in an angle from what I see and hear. Being able to have a less medical birth can be a relief for some women after lots of medical procedures getting them pregnant... for others they don't mind so much.