I have had both. I currently have the Mirena. I had the Paragard after my first son and now Mirena after my second son. Personally I liked the Paragard a lot more. I have had the Mirena in for almost 4 of the 5 years and I don't like the hormones. I am seriously struggling to lose weight, my face breaks out whenever I'm supposed to have my monthly and here's the kicker, I have had 6 ovarian cysts rupture and have had to go to the emergency room and have ultrasounds galore. I am going to switch back after my next ultrasound due to another ovarian cyst that has been like a ticking time bomb. Trust me ovarian cyst ruptures are more painful than the worst contractions. I know other women that have the Mirena and haven't had the exact issues I've had. Some are worse and some are not, but just about everyone of them has had some kind of dislike. I prefer the Paragard and am switching asap. I hope that was helpful :).