I disagree; to each their own.
OP, unless you're willing to re-evaluate your workflows, I think you'd be better off with a Windows device. Unless something drastic changes in iOS 10, the kind of granular control you want over files without working in the cloud is going to be sort of a pain and I think you'll grow to resent iOS because of it. There will be trade-offs, of course; like you said, iOS is so fluid and secure because it works the way it does, and going to the Windows route brings lots of disadvantages along with the conveniences, IMO. If your workflow is that important to you, though, I just can't recommend iOS unless you're willing to jump through some hoops.