I would also add that Scrivener is great for academic writing, e. g. it allows for footnotes which DT lack. I start all my projects in Scrivener, and then later switch to Pages, especially if I have to share my papers with colleagues: the Pages implementation of Track Changes is far superior to that of MS Word, in my opinion (and Pages is far more elegant, of course, and cheaper).
I use DTPO only as repository of all my pdf-files (currently around 7 GB) which I carry around with me on a USB-stick, so I can use my DT-database at work, at home and abroad (it get saved every other day, of course, to my hard disk).
Nils