I really love the goofiness of Happy Death Day. Good slasher without taking itself too seriously. Sleepaway Camp 1 and 2. I think the Autopsy of Jane Doe has just the right amount of terror for me. I watch it every October. Same with Trick 'R Treat, I never miss that one.
Hokum was the most recent one that really captured me. A lot of people missed it but I think it's absolutely worth a watch. Good Halloween vibes. Oh, and Undertone was scary as shit.