I know it may seems stupid to post this issue here
I have been writing android program for more than 2 yrs, but yesterday I got one call from my nephew, asking whether he should program for Android or iOS, which is easier, since I don't have any experience in iOS, so I think maybe it's cool to post here asking for your opinions.

Android if you know Java.

iOS if you know any variation of C although it is slightly different

Basically Fundamentally both are same. If you know C programming you can do both Android as well as iOS.

QNX.

Come, join us! : D

I have experience in both, and while the languages for both are about equally as difficult, i would say developing for Android is the better choice as you don't have the difficulties of the iOS certificates and the app store approval process. Also, before testing an app on your iPhone, they force you to pay them $100, even if you don't plan on releasing the app. Of course, you can jailbreak it and install it that way, but then you lose the debugging ability, which to me is pretty important. Android costs you $25 for a lifetime of development, iOS costs you $100/yr. That's my input, I hope it helps!

For me both are difficult but if I need to choose among these then I will go for Android.