I'm fine with either, personally!  Though I do like the mindset that "advanced" puts me in, so I'll cast my vote for that one.

Post length has never been an issue for me, no matter the RP or classification.  So long as I have something I can work off of, I'm pretty good to go.  Story...  Well, I enjoy adventure and mystery, especially when it comes to dark, gothic, and/or eldritch subjects!  Combat is probably a given in the Digital World, and I'm totally fine with combat, but mystery and thinking solutions are my favorites.  As for character development, I figure that'll "develop" as we go on!  I tend to write my characters with at least one glaring, potentially problematic flaw that could haunt, hinder, and get them into trouble.  Plus, character relationships between ourselves and our Digimon, especially in a world so prone to changing, should open a lot of fun doors for us, I think!