It's a question I ask every year: is 'Nightmare Before Christmas' a Halloween or Christmas movie?

This is one of my favorite movies to watch and I keep thinking when do I watch it? I think BOTH, I am that person but I don't like watching out of October-December. Have you watched it? Is it a Christmas movie or a Halloween? I don't want to influence your decision cause I want your honest opinion. The director Henry Selick said it's a Halloween movie... but what does he know.