For Comedy, my favorite movie would have to be: Fright Night (1985).
For Horror, I like: Mama (2013), Silent Hill, Mandy, It (2017), the Evil Dead franchise, Insidious, and Hellraiser. Leatherface is also a pretty entertaining horror movie.
For Sci-Fi, I’ve always enjoyed: Signs, the Alien franchise, War of the Worlds (2005), Color Out of Space, and The X-Files - Fight The Future.
For a Christmas movie, my two favorites are: Die Hard and Krampus.