Which manga should I write first?

I'm writing 2 manga series, but both are totally different from each other. One is a supernatural/blood/gore/psychological horror(also suggests a touch of romance. I'm not giving out my plot by the way :)!) And the other is a romance/comedy/drama/harem. I'm worried that if I give the romance one out no one will think the horror one will be scary. But I'm also worried that if I give the horror one first, then everyone will think the romance one is scary too(its not!) Please, tell me what you think. Thank you!