I went with the Rift because it was cheaper and (imho) way less ugly. - Rift room scale support is actually very good with extra trackers (a bit of a pain, but luckily extensions work well). - The Rift controllers are very, very good.

Overall, I just liked the Rift as a polished product better. And they have had a great track record of improving the product and dumping money into quality content.