What I actually wanted to put was "the one I'm reading or have read most recently". But looking at my preferences, I do notice a pattern:

Scout's Progress
Saltation
Conflict of Honors
I Dare

What have they got in common? Learning to fly and pilot (Aelliana, Theo, Priscilla, Pat Rin). SP wins out because of Aelliana (I have a thing for all of yuour women with names starting with A).