I would love some opinions on which would be better as a manga, and which would be better as a novel. My ideas are listed below. Thanks!
Birth By Blood-
In a world where medieval, present, and futuristic times are scrambled together into one reality, only the creators of a malfunctioning time machine know that the world is now made up of three time periods and not only one. Every year they must sacrifice one one-hundredth of humanity's population to the lord of time and space, who was angered by their attempt to manipulate time that resulted in this misshapen reality. A teenage tech-genius comes in contact with people called the Blood Birthed, who know of this predicament, and becomes caught up in an attempt to put each time back in it's rightful place.
Rumored Love-
In an elite high school for the rich and powerful, 15-year-old Eiji Nara finds himself constantly caught up in rumors and drama. Eiji, an attention-hungry and beautiful playboy, uses rumors to keep all eyes on him. So when silly rumors start up about a passionate relationship between Eiji and fellow student Daisuke Kenichiba start up, Eiji plays along, attempting to kindle a mock relationship between he and the exceedingly intelligent, yet withdrawn Daisuke who takes a strong dislike to him immediately. Eiji finds obstacles on his path to winning over Daisuke, but when and if he does, and the time comes for him to move on according to new rumors, will he be able to? Or will Daisuke become his first true love?
Read more: Which idea would be most interesting in manga form?