I found midsummar to be the much more interesting of the two.

Important to underline is that neither is bad in any way.

In Hereditary, the theme is worn on its sleeve and becomes very easy to hone in on the concepts of generational trauma, which it explores beautifully.

In Midsommar, the exploration seems to be more focused on contemporary reaction to trauma and the dichotomy between a Western individualistic approach compared to the more communal approach of the cult.

The protagonist is constantly being told to basically just suck it up by the people around her until she gets to the commune, where they share in her pain as a group. The scene with all the women screaming and sharing her pain is a perfect illustration and counter to the boyfriends cold detachment.

Furthermore, I really enjoyed a movie that made the concept of joining a cult seem like the more logical choice, a genuine story point. Most movies jump right into condemning the whole cult thing, but Midsommar seems more interested in asking why people join to begin with, which I found to be very unique to a movie.