My first ever mobile app was an experimental bit of Android Malware. It got demo'd by my colleague at Blackhat [1]. I'm definitely not a hacker, but with a few basic tricks I was able to create a pretty effective trojan which we then injected into a popular game (again only for experimental purposes, it was never released in the wild). In our lab we had literally millions of samples of Android malware, but for iOS we had only two (which only worked on jailbroken phones). Fun times.
Apple's iOS is way more secure than Android in several aspects. The best example is their 5 years of guaranteed security (and features!) updates, versus 2-3 tops in Android (even <1 with Chinese cheap brands than are very common in Europe, such as Xiaomi).
1. https://www.softwaretalks.io/v/4047/black-hat-usa-2013-how-t...