Google dropped their “don’t be evil” motto for a very damn good reason, and the safety of their own app marketplace is a fucking joke.
Facebook is even worse than Google, in that it has never stopped trying to appear innocent of wrongdoing while paddling like mad under the surface.
Microsoft… has gone all Spyware with _all_ of their products as of late, although at least their business-class stuff is moderately neutered.
Apple may Hoover up some data, but it does at least employ actual security and privacy in many places. They make stands where it makes sense to take stands, and they bend in the wind where the hurricane would snap a stiffer branch. Finally, their walled garden - although not perfect - is far safer than any other one out there. They make missteps just like any other entity run by humans, but a fair number of their actions do point in the correct direction.
If given no alternative choice that is evil-free, I will chose the least evil option as my vote. Apple it is, at least for all my personal devices.