IUI vs. IVF?

Gwenie • Mommy of an Angel👼 Keep the Faith, praying for our rainbow baby 🌈
When did you decided it was time to go on this fertility treatment path? DH has low sperm count, poor morphology/motility. Which treatment would be highly successful for male infertility - IUI/IVF? We have been trying for 1.5 years with a mmc last Oct and a recent chemical pregnancy. Please share your success stories. Thanks!