This is a hard question.
If you take art to be very broad and include movies, books, series, manga etc, then they are very important to me because I love reading and watching fiction. They are a big part of my life. I take far more personal interest in them than in science. I strongly prefer fiction to non-fiction.
On the other hand science comes with more valuable things, like technology and medication. Without science I wouldn't have my asthma medication, and then I might not have been here at all. Science is definitely more important in how it improves our lives in so many ways.
But I don't think arts are useless. Most people need to feel entertained in some way or other.
Also, the right type of book can change how people view things (even though it's rare), and it can often broaden your horizon. Even if that's small scale, I don't think it's useless.