Freddy Vs Jason is a Nightmare sequel since they acknowledge the events of the previous movies more than Jason. There is a brief talk about Jason but they focus on Freddy more, I mean, the movie opens up with clips from the other Nightmare movies, if that doesn't count I don't know what would,
Plus everyone in the movie knows about him and the adults are keeping the kids safe by hiding it, plus the Hypnocil talk that connects this movie directly to Nightmare 3.
The movie could be a sequel to both but it is much more connected to the Nightmare movies, there is no denying that. Even his house is in the movie,
I don't know why Jason fans get offended when this is brought up, It is not like Parts 8 and 9 or 10 were so great, I think if you wanted to count from part 7 to FVJ and skip the other 3 it would be fine. Since those other 3 are the worst of the series. I think having FVJ would be better than part 9, At least FVJ has F___ng Jason in the movie..... Part 9 was a horrible laughable mess, it didn't even have Jason for most of it.