I love my sgsIII but no sense deluding yourself about iOS. In a lot of ways it is more friendly for hacking stuff than Android has ever been. You don't need busybox in iOS to run commands, the real commands are all there. You dont need Dropbear ssh from anywhere, full OpenSSH suite is compiled for it. The terminal in android feels much more like being on a phone where as if you're in the terminal on iOS you can never even tell it is a phone, it feels like a full computer. If you want to use your phone to administer other linux computers, you can run ssh-keygen, get keys, put them in the servers and log in passwordless all from your phone. The phone runs bash by default, and uses apt (best packaging system ever) for its packages.
There are many other problems of course, you wont be flashing any custom roms or anything, but no sense not knowing how things are.
That being said I won't be switching to iOS anytime soon.