Ouroboros is much darker and has deeper plot lines than Bitter Blood, but they have the same feel. They are both about crimes with underlying relationship plots.

Although from two different countries, the feel is much the same; both crime mysteries that involve geniuses and a hint of romance. God's Quiz is more medical and main character mystery based, but they both have that amazing plot intrigue and touch of romance (though Subete ga F ni naru's romance feels a bit deeper over the course of the show). If you liked one you'll def. like the other :)