Romance or Horror?

I want to start writing novels, but I'm stuck between two ideas! One is a horror story about a demon exorcist and the Romance is about a psychic girl who can see a guy.....but she's the only one that can see and hear him and must help him find his way back to where he belongs! So, which one should I do! (Please don't say I should combine them or that my ideas are stupid! It's my first time!)