I do not recommend the IUD at all. I had it for almost 3 years and had many troubles with it. The main issue for me was I was so bloated for most of the month, I looked 5 months pregnant at any given time. Since I had my daughter I have been asked by strangers more than a dozen times if I was expecting or how cute my belly was. Ohh it was soooo frustrating, I am 5'4 and weigh 115lbs, how do you even ask such a question without knowing for sure, sorry, sore subject for me. I had it removed and had a tubal ligation in August. My stomach is back to normal thankfully.
I also used the nuva ring when it first came out and I liked it until one morning I was making the bed and found it in the sheets. We had gotten busy the night before and it must have came out then. The next month I went back on the pill. Not taking that chance again. Not that the pill worked either, 3 months after that I found out I was expecting my daughter. It really only does take one missed pill.
Good luck deciding, every choice has drawbacks. Hopefully you'll find one that works for you.