And he is really dirty. A recent HN commentary by me along the same lines: https://news.ycombinator.com/item?id=6979024
Their most commonly quoted ‘documentary’ as the extreme of that lack of journalistic value is on Scopolamine (a compound commonly used in pharmacy) and the fear its instills as a will-bending drug in Colombia: it doesn't feature a pharmacist explaining that the fears are pointless, just a scrawny hipster wondering if anyone has actually witnessed an incident. It's a great case of ethnography and which-hunting, but the omission (presumably intention to keep the sensationalist value of the piece) make it fails as an investigation.
The Android app does photo backup too, which is one of the main things I currently use Dropbox for.
You shouldn't be. Their "encryption" does little more than provide them a way of saying "We can't comply with your subpoena because we don't have the user's key!"
Granted, Dropbox's security is pretty laughable too.
Your best option is probably to store e.g. a TrueCrypt container in either service. (Dropbox will only sync the parts of the file that change, so there's that. Pretty helpful if you've got a 1-2GB TrueCrypt container.)
One can assume that more free and open BTSync clients will appear in the coming years, at which point I will probably check it out.