Cool story, both the S5 and M8 have fastest cameras then the the iPhone 5s now, it wasn't the case before and the iPhone was much faster but they have caught up and leap forged it for now,
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I personally havn't seen an app crash in forever on my phone, but I will take your word for it and I agree on the whole iOS apps are still more polished and good developers tend to try harder, typically the UX is just as good but the UI is better, feature wise there about the same with Android taking the lead since you can do much more as a developer.
I think the difference is with the iPhone 5s you just click and have confidence that the picture is good, its not the best photo but its consistently solid and thats not something you get with many other cameras. Also until the M8/S5 it was also the fastest, Android has caught up in that respect now but you still don't have the confidence you do with the 5s.