Neither are any good in their current forms. I wasn't able to download or upload any files with Dropian, and while I was able to do this with DropN9, I can only download one file at a time - downloading directories isn't possible. Plus, none of the directory structure is preserved either, they are all downloaded into the same directory, AND you can't choose where this is, AND it's inside MyDocs, which means no symlinks. Basically, syncing files with either of these applications is such a headache as to be near impossible and not worth the time or effort.

Please developers, have a look at DropN900 to see what functionality you need to implement - basically, SYNC is what we're after.