I think both are essentially linked, and one is not more important than the other. I talked to my orthopedic surgeon about why he does what he does, and he sees the human body as a piece of art, rather than bones and blood and tissue. Art is science, and science is art. You can't have one without the other.
Also, you said we wouldn't be here without science, but I don't think we would be here without art either. I see love as an art, music is an art, color, passion, all these other things that inspire and drive us to do things. We may be here by scientific methods, but we are alive for art.