Keeping the Worlds Straight

This morning, I started counting up the universes that I've got planned out and am currently writing in, or that I have stories that I plan on coming back to – recurring universes, as it were. So far, here they are:

The Sinner – my two weird west stories- High Moon and The Devil's Due.
Sparks and Spells (that's a tentative name) – the alt history fantasy/manapunk pre-WWI universe – Battle of Wildspitze and Finding the Fire. (This is the universe that Scott Roche and I are sharing / writing in.) New stories coming from both of us soon.
Prodigals – The Assignment, Blood Red Sand and the NaNoWriMo project I did in 2009. My first Space Opera universe.
Exiles – You haven't seen this one yet, but it's this year's NaNo project, and you'll be getting stories as well as the longer work soon – Space Opera. Heavy anime influences.
Scions – You haven't seen this one yet either. Last year's Nano project. This started out being a story of people who formed telepathic bonds with wolves, sort of like the Gandalara cycle did with giant cats. Then the wolves became ghosts – spirits. Then one of them became a bear. And things sort of went crazy / off the rails at that point. This was a fun one to come up with, but it needs some work before it's ready for anyone to see it.

And there are others that I have up in my head.
For my readers (and listeners), do you have a preference? Is there a particular story / setting / genre that grabs you? Sound off in the comments.