This is not about android vs iOS or the silly "applesucks-appleisthebest" dichotomy. It's about users' security and privacy. It may be pretty hard to develop malware for iOS, but in China there are some people who are working pretty hard to do it and have strong incentives to do so. I don't have to say what their motivation is, because anyone with at least a superficial understanding of how China works will know it.
The point is that these are apps the vast majority of Chinese iOS users have in their phones. Wechat is one of the world's most popular IM platforms and if you live in China or have contacts in China odds are that you have it in your phone. Reason being that other rival platforms are simply not allowed to operate in China.
The articles point out that many Chinese developers snatched the compromised version of Xcode from a local Baidu depository because download speeds from abroad in China are pretty low. They are low because of surveillance, and it's possible that many bona fide Chinese developers were affected this way. But we are talking about China's largest internet companies here and about apps that are by no means amateurish. Draw your own conclusions from this.
There are reports coming from China now that more than 350 apps may have "backdoors" inserted into them via this XcodeGhost malware. I have tipped MacRumors and another popular rumor site on this, but no one is paying much attention to this. It seems that Pope Francis's visit delaying the delivery of new iPhones by a day is more important.
The supposed author of XcodeGhost is now reaching out saying that this was an experiment meant to harm no one. Believe this at your peril.
https://github.com/XcodeGhostSource/XcodeGhost (in Chinese)