I really liked Midsommar. To me, Ari Aster is BY FAR the best horror director out there right now. That being said, I think Hereditary was better. The last 20 minutes of Midsommar was a slight letdown compared to the amazing set-up, whereas Hereditary absolutely nailed the finale for me. Be aware, they are very different movies. Hereditary is much more intense and keeps you guessing. Midsommar is predictable as it lays out everything that's going to happen and isn't trying to confuse you if you pay attention. It's more of a character/cult study that is done magnificently.