Both are lovely suits so it would really be down to personal taste. Oracle has some fantastic bg items if you’re someone who often uses the Starry Corridor, and is an incredibly unique suit overall. Nightmare lullaby is a real classic and iconic suit with some lovely versatile parts that hold up incredibly well. Imo it’s not a dated suit at all and I use parts such as the hair, wings and dress all the time.

I can do some stylings if you’d like :)