Copper IUD will increase your menstrual flow a lot (I hate that). 5 year IUD has low amount of hormone, but unexpected bleeding in between menstrual cycle is a big minus for many people. My OB said she removed more IUD than putting them in. I chose Nuvaring finally. It is easy and effective, but it cause headache in me (I am sensitive to hormonal change before period and will have headache because of that)