A.L.
I have to chime in with great reviews for BCBSNC. I have had experiences with them when I was covered through my employer as well as taking out an individual policy on my daughter (it was cheaper than adding her to a different insurance i had at the time). I was very happy with the plans, coverage, and customer service I received from them. A BCBSNC representative even stopped by the hospital when I had surgery to just introduce herself and 'check' on me when i was in the hospital. She didn't talk about insurance or anything...just peeked her head in, introduced herself and said she hoped i'd feel better soon. Crazy, i know.
I have no experience with United Healthcare, but if BCBSNC was an option for me to choose again, I definitely would...i'm lost in the land of Aetna now.
Good luck with your decision!