Why I chose iOS over Android for Mom and Dad

In a nutshell, it's all about use cases.

For the record, I'm no fan of Apple. I myself am using an HTC One M7 and I think it terrifically suits my need. One of the many things that truly distinguishes Android from iOS is the ability for applications to run in the background. Many argue that this is good, while probably equally many believe otherwise. I think it's more of a differentiation of design logic, not some sort of advantage or drawback. This kind of differentiation provides different use cases with 'best' solutions. So the old saying applies - there is no best, only the most suitable.

And when it comes to daily usage for Mom and Dad, I believe iOS is the better option.

Security is the major concern. Android is known as the 'open' one. The openness allows application installation from practically anywhere. It could mean more danger when it comes with the twisted many-app-market situation here in the mainland. While I could probably identify a malware when there is one being installed, I don't think Mom and Dad could or should even bother. With iOS, one could only install applications from the neat and safe App Store. And Apple takes the responsibility of reviewing the legitimacy of the applications they provide.

iOS comes easier in terms of usability. I think the phrase I'm looking for is 'everything just works'.

iPhones are generally better made, in terms of display quality, voice quality, photo shooting, etc. Everything is good with an iPhone. They are not just acceptably good, top-notch good. One could probably argue that Samsung Galaxy S6 is the best in terms of photo shooting nowadays, with the fancy test out there and stuff, but iPhone 6 probably comes 2nd or 3rd. And it's the same situation with basically every aspect of an iPhone. So when combined, even if iPhone is not the best, it'll be quite competitive with nothing compromised.