The first device to buy for testing applications on iOS?

Question

iOS

Started developing for iOS. The built-in simulator is good, but something real is needed.
Looking towards iPod touch 5
or
iPod 5C ref. ( www.aliexpress.com/store/product/Iphone-5C-100-Fac... I
also heard that the iPad would be a good option, as it allows you to run both types of applications. But there are several versions and, accordingly, permissions.
Tell me:- )

Answer 1

It is better to take some old iPhone. For example, 4S, so that in addition to the actual testing itself, you can also watch the performance on a real device.

Answer 2

Any other opinions? Interested in iPads. How is it with them? There are also mini and retins :-/