"Lab Rat" is my favorite. I love the plot and I'm dying to see how it continues. MC's life is tragic in all the IFs, but somehow this one has gotten a soft spot in my heart and I really want to know more about their story. I also love the ROs, I'm excited to know more about them. Specially Winter, got my heart almost since the first moment they appeared.
"The Howl" is second for me. I find the idea of a not-so-legal organization helping people on MC's situation and offering them a way to, somehow, figure things out very interesting. I also want to catch my MC's evil twin and kick her ass. I like all the characters and their personalities. I'm curious about their stories too and what took them there.
Then, "Moonlight Protocol" and "Lost to Time" tied for me. I'm not really into sci-fi, but they're both really interesting as well. If I had to chose between these two, I'd pick the one that you enjoy writing the most.
Finally, "Daddy was a killer" has a very interesting plot as well, it just ended as the last one because I liked the others better.