Well Warner Bros. released it in theatres here in 1996 with their logo at the beginning of the film and their logo on the movie poster. According to IMDB it was released in the UK and pretty much every other country in the world by United International Pictures (UIP).
So I was going to say put it with your Warner collection.
But after looking at the beauty shots again, I would say put it with your Universal stuff since only the Universal logo appears on the spines of the slip and SteelBook which is probably how it will be displayed on your shelves.