I like Devastation definitely more than Genocide. I'm not a huge fan of Deva as a child, but she has a fun powerset and backstory, and I think the Children of Kronus have creative designs and there are lots of potential stories with them.
Genocide is just very meh. Couldn't stand her in Simone's run, but I thought her role in the Four Horsewomen story was decent.
You realize it's fanart, right? I think you're being a bit harsh.