Dementia 13 is a nice psychological horror, an eerie gothic atmosphere, with a really creepy score, and some haunting visuals. I imagine the kills in this film were considered quite brutal at the time, and Francis Ford Coppola did a decent job directing this film with some unique shots.
On a technical level, The Power of the Dog is outstanding, masterclass of acting from all involved, gorgeous cinematography and camerawork. A haunting score from Jonny Greenwood, and smart direction from Jane Campion. However, it's a shame the story doesn't quite follow suit. It's far from dull, and I liked it a lot, but I just wanted more from it.