The Harshest Critic, The Biggest Fan
Some pretty smart people, including Harlan Ellison and JK Rowling, recommend that authors write to please themselves. We embrace this advice and encourage you to do likewise. Trying to predict the market is a recipe for frustration, as is trying to imitate the style that you imagine other people want from you.
In practice, this is a bit more complicated when there are two of you. We pointed out way back in the Skellyverse’s earliest posts that a writing partner has to be someone whose tastes and interest align with yours, because the first thing you’ll have to agree on is what to write.
If you can do that, next comes agreeing on how to write it. Even if you both love science fiction with strong female characters, you’re still working in a huge space. That’s a good thing, because you have lots of room to work. But it does present the possibility that you and your partner might get separated.
If you can collaborate within a framework, so you know you’re both writing the same book, then you can fly in loose formation. If you don’t have a good feel for the voice, and you have to check in with each other over every sentence, then you’re not getting the value out of your collaboration.
Working with a partner, you have to write to please each other.