Actually it depends on what you're trying to do - a good Android developer will spend the same amount of time implementing some of the features as a good iOS developer and some things are easier to do here and some there. The main issue I think is the learning curve, because on iOS you usually have to think about memory allocation (although it got better with ARC), but other than that I wouldn't say that either of the platforms is "tougher".
The main reason some apps come to iOS first is better app discovery and a larger user base. If you manage to score a high user base, the monetization is quite awarding so that's why developers choose iOS first. Definitely not because of iOS being easier than Android.
The main reason some apps come to iOS first is better app discovery and a larger user base. If you manage to score a high user base, the monetization is quite awarding so that's why developers choose iOS first. Definitely not because of iOS being easier than Android.