I cant decide between a neonatal nurse or a physc nurse? Your opinion?

Okay well I'v known that I wanted to be a nurse for a long time, and I dont want to just be a general RN, I'v volunteered at Cook Children's Medical Center and I'm thinking about looking into Neonatal. But I'm also really interested in the Physc ward stuff, and mental illnesses. At Cooks there is a Child Physc Ward inside the hospital and I'd love to work there!! I just don't know how to get there, or how to choose between the three, your opinion?