I had my son at Renown in 2006 also. I was induced at 6am and the baby didn't come until 6pm. It was a VERY long day. I had the most amazing nurse though which made it easier. She was supposed to be off at 6pm, but she stayed and helped deliver the baby since she had been with me all day and she stopped by the following day to see how we were doing. Yes, I had to share a room, but I have 3 kids and had to with the other two also, so it was expected. They were great to my husband too.
The downsides. They told me my son (perfectly healthy) had to stay in the nursery and I couldn't have him room with me. That I didn't really like at all, Second, the anesthesiologist...the nurses raved about him, but I have never been treated so badly. When I asked for the epidural he informed me I was complaining and must have a very low pain tolerance. I've had 2 kids and know how to handle labor pains! Also, my son was face up which they later told me probably caused a more painful delivery. After inserting the epidural he only came back to check on me once and when I told him I could still feel everything he said I had to give it more time to work. It had been an hour at least! I asked the nurse to have it re positioned and she called the anesthesiologist who was in an emergency procedure and never showed up so I gave birth to be my son not being able to move because of the epidural needle, but never getting any medication.
If I had to choose, I would tour both and unless Renown has had major changes, I'd most likely choose St.Mary's.