As per my opinion both is good, yes, both has the unique specialties with it. In iOS the standard maintained by the apple is incredible and the drawback is its closed one, ie not a opensource one. The majority market share is in United states alone, nothing much in other countries.
Taking android on the other hand, it has the majority market share than iOS, & its Opensource as well. Many of the mobile comes with the Android OS only, the drawback is its quality and less no of apps & open source.
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