[runjake]

What a terrible answer.

My advice is to go through introduction tutorials for both. You can download the developer tools for iOS or Android for free. You can test your apps on a physical Android device for free; but for iOS, you're stuck with the simulator unless you plop down $99.

Do you want to do this as a hobby? for me?

If a hobby, I'd lean towards Android, because it's more open and easy to deal with. I can interface with Arduinos or practically anything else without having to deal with licensing fees. I have more freedom to roam API-wise.

If for money, iOS hands down. Android may have bigger market share, but the money is still in the iOS App Store. More people buy apps for iOS, sad but true.