I always liked the 4th Friday the 13th film the best, and as for the Nightmare series, the first and third films are what I would consider great, along with maybe New Nightmare.

Gizzy2000: Yes, I am a big fan of the original Scream movie, I think it was very clever and it pulled off being funny as well as genuinely intense and exciting, and I also think that the opening scene of Scream is one of the best opening scenes in a horror movie. As for the Scream franchise it is unique in that the series revolves around the leading lady rather than the villain, even though the ghostface mask is pretty iconic. I think maybe that's the reason why I enjoy the franchise because it has some more character to it rather than just being a series of films following the exploits of an unkillable villain. Although I must admit that the 3rd film is poor and the 4th is mediocre at best (although it does have some moments of greatness).

My favorite horror franchise would have to be Halloween. I love the first one, and I enjoy most of the sequels, except for Halloween Resurrection of course. Donald Pleasance serves as the Van Helsing of the series and he definitely is the reason why the series went on for as long as it did.