Please note, this blog entry is from a previous course. You might want to check out the current one.
You do not have to get this working on both platforms. Pick whichever of the two you want. It does, however, have to work on a real device, so pick the device you have the hardware for.
The code for the previous tasks has already incorporated both iPhone and iPad. In addition to the simulator the code has been tested on a first generation iPad.