I trust the vendor whose primary revenue stream comes from me, rather than the one whose primary revenue stream is me (or my private data). I trust Google to abide by their T&C's about as much as I trust the NSA to abide by the laws governing the extent of their actions. Which is to say, precisely none.

You can argue until you're blue in the face but Apple have little to no incentive to exploit my private data while Google have every incentive to do so.